Disk Utility First Aid Failed External Hard Drive

Mac’s built-in First Aid tool is designed to verify and repair a range of issues related to corrupted files and apps, startup issues, and, crucially, external hard drive problems. If you have additional internal hard drives or external hard drives connected to your Mac, they too will be visible. The drive should say unallocated; Note: If it does not you will need to right-click and delete the volume first. Launch the Start Menu to restart your device. First Aid "First Aid" is a repair feature in Disk Utility. Mac SSD not Booting? Try 5 Fixes to Boot up Your Mac where you'll need to select "Disk Utility". Secondly, Repair the unmounted Macintosh HD in recovery mode. Easy Disk Drive Repair is a simple hard drive repair software for Windows. As an example, connecting to a remote computer via SSH, or Disk Utility simply refusing to launch. Go into Applications > Utilities > Disk Utility. From terminal writing: diskutil mount disk2s1 & diskutil mount readOnly disk2s1 both resulted with this Volume on disk2s1 failed to mount If the volume is damaged, try the "readOnly" option; From terminal writing: diskutil repairDisk disk2s1 & diskutil repairVolume disk2s1. Otherwise, click Repair disk (if suggested) or try repeating the First Aid procedure until the result indicates that the hard drive is OK. It has the capability to detect and repair the damages to partition map, master directory block, device driver and so on. Disk Utility is unable to repair this at first, but the fix is this: Use diskutil list to find the right drive id. Go to First aid. However, if the disk is unmounted or unrecognized then you might have to consider running ‘Stellar Phoenix Mac Data Recovery’ tool to recover files from the unmounted hard drive. Once Disk Utility is open, select the View button on the upper left of the window and select Show all Devices. I am assuming that you are running OX S so it sounds like the system is corrupted. Disk Utility (sitting in System -> Administration) will give you the serial numbers for all your disks. First Aid will run and check out the possible errors on preferred disk. Disk Utility no longer sees it at all. Either that or another Mac in Target Disk Mode to access your iMac. It is located next to "First Aid" button. Disk Utility Use Disk Utility to check the status of your hard disk and make sure that you don't have a failing hard drive. The first volume (parts 1-99) contains current regulations issued under subtitle A—Office of the Secretary of Transportation; the second volume (parts 100-177) and the third volume (parts 178-199) contain the current regulations issued under chapter I—Pipeline and Hazardous Materials Safety Administration (DOT); the fourth volume (parts 200. Buy products such as WD 1TB My Passport Portable External Hard Drive, Black - WDBYFT0010BBK-WESN at Walmart and save. See Also: How To Clean Cache On Your Mac Step 5. Step 1: Open Disk Utility after navigating from: Finder > Application> Utility. Disk Utility first aid will not do anything, it shows up as nothing being wrong with the drive unless I. Recoverit Data Recovery is the most effective hard drive data recovery software which helps in retrieving data from the hard drive of personal computer, USB drive, external hard drive and any other device which you use for storing the data. explained, when I run first aid I get the following message "problems were found with the partition map which might prevent booting. Once you have backed up all your data, you can try a few fixes to your "unmountable" hard drive problems. First Aid: Verify and Repair HFS+, APFS Drives with Disk Utility Tuesday, May 22nd, 2018 | Author: Tom Nelson. Open Disk Utility. Make sure the device can be detected by the machine. And how do you tell if a hard drive is failing? If you restarted the operating system, but the problem remains, it is best to have a backup of the data from the computer, since the hard disk may crash at any time. Disk Warrior has been in business since 1984 and has a lot of experiencing with file system repair. Step 1: Launch Disk Utility from Utilities. There are times when these drives resist recognizing in computers but can be avail in Disk Management. Shop for External Hard Drives in Computer Accessories. I can't imagine the hardware is actually damaged otherwise it wouldn't even recognize it (Right?). How To: Apple MacBook Pro RAID 0 Array with 2 Intel X25-M SSDs. In Recovery Mode, click on Disk Utility. 3)Failure to eject external hard drives and related storage devices before disconnecting them or powering them off. Again, what if forcing your Mac drive to display the external hard disk drive doesn't work? Well, the next step is to utilize First Aid. Because of this, failed hard drive data recovery is an important issue that needs some thought. However, if the disk is unmounted or unrecognized then you might have to consider running 'Stellar Phoenix Mac Data Recovery' tool to recover files from the unmounted hard drive. Click Run, then click Continue. Back up as many of your files as possible, reformat the disk, and restore your backed-up files. If First Aid is unable to repair the external hard drive, it may be formatted in a file system that MacOS can't read, or it may be a faulty. Click the button, and name your disk. If you have bootable drive with osx - if not make one- and on start up press cmd. Whenever we find any problem on a drive, the first solution is to run First Aid. 1 inserted into the floppy drive. Launch Disk Utility. Just click the Apple logo in the top left corner of your screen and select Restart. status using Apple's Disk Utility. To get to First Aid: Click on the partition to select it. Otherwise, continue to the next step. On the top menu of the Disk Utility window you will see 'First Aid' (see screenshot above), click to run the check. At the boot menu, choose "Disk Utility" (if using an Installer disk, pull down the "Utilities" menu to access Disk Utility) Go to "First Aid" and verify the disk, then repair if needed Now perform the original task that threw the "Couldn't Unmount" error. Mount the “Install Mac OS X Lion. How to Open Disk Utility on a Mac. Result 1: Nothing is wrong or. I was be able to use my external hard drive. If all goes well it will produce a green check mark. In Mac OS X, Disk Utility is a multipurpose program for working with hard disks, disk images, CDs, and DVDs. Shop for External Hard Drives in Computer Accessories. (or a external drive) using Disk Utility you will hopefully be able to recover your files. Here, click on Repair Disk button to repair the volume. You need to recovery your files , check the link for free softwares, and use the "Recuva". Search in the list on the left and see if the USB drive appears there. Tried running Disk Utility and First Aid again but failed as above. I'm aware that Windows can do a better job at repairing exFAT drives so I was hoping to fix it in Windows, either with Windows own disk repair tool or third party software. Run Disk Utility's Repair Permissions: Starting with 10. Now click the First Aid button and Run first aid on the drive. Repairing Disk Permissions with First Aid on OS X El Capitan and above. Therefore, before attempting to resize it, first make sure the Partition Map Scheme used by the hard drive is GUID Partition Table; check it under First Aid tab. You should also include a utilities folder containing Disk First Aid and any other disk utilities you may want to use. First Aid on recovery mode can serve as a computer flash drive repair tool on Mac. Note: Some volumes can be verified but not repaired (e. crack open the case and remove the hard drive and get a connector such as the Voyager from OWC (otherworldcomputing. Open Applications, click Utilities and select Disk Utility. Expert news, reviews and videos of the latest digital cameras, lenses, accessories, and phones. Highlight your hard drive and select Mount. Repair Disk verifies and, if problems are found, corrects issues with the directory on. The Disk Utility interface is the same one you'll see on your Mac OS X desktop, but run it from here and it'll be able to repair problems with your system drive. Click the button, and name your disk. You might wonder how Mac disk cleanup works or how you can effectively clean up a Mac’s hard drive. Another great use of Disk Utility is to create disk images. The tool support RAW hard drive data recovery professionally. The Mac operating system requires that you use a disk formatted using a compatible file system. Connect the USB Drive to your Mac. Time machine external became unmountable in (running El Capitan) but I also tried it on a different mac running Leopard (yes,) still didn't mount. As true Mac enthusiasts, we would recommend the utility bundle, MacCleaner Pro. Release the keys when you the Apple Logo appears. From the appeared menu select the attached boot drive. Click the Repair Disk Permissions button to start the. At the boot menu, choose "Disk Utility" (if using an Installer disk, pull down the "Utilities" menu to access Disk Utility) Go to "First Aid" and verify the disk, then repair if needed Now perform the original task that threw the "Couldn't Unmount" error. Otherwise, continue to the next step. We'll go over how to perform hard disk repair on Mac using software solutions. To get to First Aid: Click on the partition to select it. Kill Viruses. It will look something like the orange icon below. First we will check the basics, and from there we make sure that MacOS is set up to display external drives, can mount the drive, and that the drive has no errors on either the disk itself or its file structure. I loved that first one so much that I bought the second. First Aid "First Aid" is a repair feature in Disk Utility. Question: Q: First Aid failed on external hard drive, Time Machine backup I dropped my usb hard drive which is used for Time Machine backups tonight. Try running First Aid on the disk and then retry mounting. If it does appear, select the volume icon (just below the drive icon), select the "First Aid" tab, and click the "Repair Disk" button. You can't repair CDs and DVDs. If you can't boot to recovery it's possible (and, I believe, likely) that your hard drive mechanism has failed. 1TB External Seagate hard drive appears in Disk Utility but I can't access it. You can create a disk image of a desktop drive, portable drive or even a DVD. Step 1: Launch Disk Utility from Utilities. First Aid in Apple's Disk Utility is a small utility designed to verify and fix minor problems of a drive, such as repairing the drive's data structures, fixing external drives not mounting on Mac, external drives not readable on Mac and so on. Next, check disk errors with First Aid. Go into Applications > Utilities > Disk Utility. When the Recovery window appears, run Disk Utility. I'm presuming that shutting down, waiting a short time and restarting doesn't fix the issue. You may also try a cloning application and verify if the clone tool shows your hard drive. Document the disk number provided in this window (Disk 1, Disk 2, etc…). Step3: After this step, from the Boot menu access Disk Utility. First Aid tool will check the disk for errors and then attempt a repair as needed. You can use the built-in Disk Utility to format your drives to ensure compatibility. and then click First Aid. By this means, you can make use of USB boot drive. The "ntfs-data" partition was automatically detected and mounted. We'll go over how to perform hard disk repair on Mac using software solutions. Open Disk Utility (you can find this application by pressing Command + Space Bar and searching “Disk Utility”). If that's the case, move on to Step 3. I've not needed a disk repair tool in a long time. It confirmed that the drive had problems, but said they "could not be repaired. If nothing from the first 3 cases works for you, you can try the methods described below. Other tools are applied to Volumes, like First Aid or Erase. I click Verify Disk: Disk Utility stopped verifying "1 TB Hard Drive" This disk needs to be repaired. Step #2: Click on the " Mount " button by right-clicking on the My Passport external hard drive on the left side of the screen. Disk Utility first aid will not do anything, it shows up as nothing being wrong with the drive unless I. When external hard drive infinite loading problem happens in Windows 10/8/7, if you have saved many important files on this disk, the first thing you should do is to restore data from the target disk. They charged $1500 but they were able to extract some (though not all) files from the drive. Of course, First Aid can also repair issues with your internal hard drive, for which you will have to access Disk Utility through recovery mode. " Now the external drive is not mounted at all, but the light is blinking and it sounds like it is spinning normally. Whenever they connect an external hard drive to a USB 3. Disk Utility is a hard disk management application that comes with the Mac operating system. Before continuing through any troubleshooting tips mentioned below, the first thing to do is backup up all your data from your Mac hard drive to ensure that it’s safe. I checked the external drive with Disk Utility, but First Aid "failed. If you have additional internal hard drives or external hard drives connected to your Mac, they too will be visible. Click on Populate. Mac External hard drive not showing up on my El Capitan style. First we will check the basics, and from there we make sure that MacOS is set up to display external drives, can mount the drive, and that the drive has no errors on either the disk itself or its file structure. My only guess on how to restore the lost hard drive space is the run DiskWarrior if you have it. Tried disk repair, tried First Aid. No response. Once it’s done, try to complete the same task again. Before continuing through any troubleshooting tips mentioned below, the first thing to do is backup up all your data from your Mac hard drive to ensure that it’s safe. To run Fist Aid. Disk Utility is a program that handles all the repairs and formats of various types of storage devices, including hard drives but expanding outward to flash drives and other external devices. Highlight the. I've not needed a disk repair tool in a long time. (Also in the Disk Utility. Go to First Aid and verify the disk. Now I wish to mount it again, I tried pressing the mount button in Disc Utility. Easy Disk Drive Repair is a simple hard drive repair software for Windows. Otherwise, continue to the next step. Go to Menu Bar and click on “View”. If you have additional internal hard drives or external hard drives connected to your Mac, they too will be visible. July 1, 2018 Title 30 Mineral Resources Parts 1 to 199 Revised as of July 1, 2018 Containing a codification of documents of general applicability and future effect As of July 1, 2018. The fourth of four drives failed. Disk Utility has a lot of talents, some less well known than others. The Mac operating system requires that you use a disk formatted using a compatible file system. Step 1 Restart your Mac and press Command + R during the reboot until the Mac boots into recovery mode. If the disk is visible in Disk Utility but it did not mount, select the disk and click on First-Aid. Perhaps you frequently get errors when trying to open or save files. Hope that helps. What I suggest is to use a bootable external drive to see if you can gain access to the hard drive and copy off your data and try to make repairs. Select the disk and click on “VerifyDisk, Repair Disk, or First Aid” Proceed further after selecting any one of the options. If your Mac is with OS X El Capitan, macOS Sierra or latest High Sierra, select Macintosh HD on the left and click on First Aid. First Aid checks the external WD hard drive for errors like the corrupt filesystem, corrupt partition, files stored on it are corrupt, bad sectors and fixes disk permissions. Access Disk Utility from the appeared Boot menu (however, if you use Installer disk, go to Utilities menu and click Disk Utility option). Back up as many of your files as possible, reformat the disk, and restore your backed-up files. Sometimes, data present in the physical drives (Internal/External Hard disk, Pen Drive, etc. Disk Utility first aid will not do anything, it shows up as nothing being wrong with the drive unless I. It has the capability to detect and repair the damages to partition map, master directory block, device driver and so on. Recover Data from Slow and Unresponsive External Hard Drive External Hard Drive Takes Forever to Load in Windows. If it does, clone it up. In the sidebar, select a disk or volume, then click the First Aid button. The data needs to be read as quickly as possible, and the HR department would like to maxmimize drive use as much as possible. Open "Applications," "Utilities" and then "Disk Utility" if the drive still doesn't respond. Other tools are applied to Volumes, like First Aid or Erase. Please mount it automatically after the Mac OS identifies the drive, but sometimes, it does not work. Mac: To check hard drive health, Mac users need to use the Disk Utility. This feature checks the file system for errors and attempts to correct them, all without much intervention from you. function in Disk Utility to convert it to Mac Enhanced Journaled, but it failed. Verify the disk and repair it if it's necessary. With the advent of OS X El Capitan , Apple made a few changes to how the Disk Utility First Aid feature works. Click on the "Erase" tab (next to "First Aid"). Step 1: Launch Disk Utility from Utilities. Using the First Aid option, you can address problems with your hard drive and potentially repair a damaged or corrupted disk. First Aid function won't work and the drive won't mount, or do anything really. It is also possible that the drive is physically failing if the Repair utility fails. ' That's how to fix ' the disk you inserted was not readable by this computer. See Also: How To Clean Cache On Your Mac Step 5. Release the keys when you the Apple Logo appears. Make sure the device can be detected by the machine. Always backup your data before running First Aid scans of your hard drive. RELATED: How, When, and Why to Repair Disk Permissions on Your Mac. Attached is the dialogue when I run First Aid. When you restore from one volume to another volume, an exact copy of the original is created. Related Documents. Mac has a built-in utility called First Aid. Headed over to Disk Utilities and the hdd is there but under the First Aid tab, Verify Disk says "Verify and Repair disk "HARD-DRIVE" ** /dev/disk1s1. Time Machine failed today. I tried ejecting, unmounting, and re-mounting the backup drive in Terminal through: diskutil eject /dev/disk3s2. When I went to reinstall the OS, it asked for a disk to install it on and nothing would come up. * A computer being used by the HR department needs to ensure that all of the data on that computer is protected from a single hard disk failure. Run First Aid repeatedly until you see the following message at the end of the scan, where diskname is the name of your disk: The volume "diskname" appears to be OK. When it opens, click on your hard drive in the left column sidebar and the click Verify Disk followed by Repair Disk under First Aid. In Disk Utility, the drive should show up in the left-hand column. by Ted Landau, Macworld. It's ready to go right out of the box, simple as pie, and for me, I love how they both stand up like books and so take up much less room on my desk. Other kinds of problems with the external hard disk. While most external drives connect via USB, some use FireWire, eSATA or Thunderbolt ports. List item On your Mac, if WD shows up in the Disk Utility panel then connect another HDD and restore your WD to it. Power off your Macbook or iMac completely. Launch Disk Utility. Because you've booted the system from the Recovery HD volume, you can repair problems with your start-up hard drive. In MacOS, "Startup Disk" option, it cannot detect my 500GB disk but if I went in "Disk Utility" there is the disk but cannot see any partition inside. Enter the USB boot drive to your Mac. From what I understand, Windows doesn’t always like the way Mac’s do the formatting on some larger drives, though, so give it a try and if your Windows machines don’t like it, just format the drive with Windows. Although the utility is used to manage a crucial hardware. If you can't boot to recovery it's possible (and, I believe, likely) that your hard drive mechanism has failed. Open the Disk Utility and choose "First Aid," then "Verify Disk. Select your hard drive and click on First Aid. If your drive shows up here but isn't mounted, click Mount. Open Disk Utility at the OS X Tools menu, and select your external drive device (not the drive itself). Disk Drill for Mac is a free Mac data recovery tool that's easy to use and efficient. macOS Sierra: Delete Your APFS Partition the Right Way. (This is obvious we need a USB first, then only we can format it 😛 ) Now we need to open Disk Utility. So Disk Utility failed in exactly the same way when trying to run first aid. Of course, you’d want the best external hard drive for Mac, especially if you want to avoid heartbreaks. Highlight the. Repair your Drobo device with Disk Utility and then turn the journaling back on. Therefore, before attempting to resize it, first make sure the Partition Map Scheme used by the hard drive is GUID Partition Table; check it under First Aid tab. Print this article or open it on any other device. The Recovery HD has quite a few useful tools available such as Disk Utility, Safari, A Download Link for OS X and the option to Restore from a Time Machine Backup. So, you can use Mac inbuilt Disk Utility to check and fix the startup disk errors and issues. Because you've booted the system from the Recovery HD volume, you can repair problems with your start-up hard drive. Go to First Aid and verify the disk. Best would be to plug-in to a Mac having the older version of the Disk Utility. Does Readyshare not support multiple partitions on a single hard-drive or do I need to change something in my setup? When I connect the USB hard-drive directly to my MacBook, I can see and acess the 2 partitions. Recoverit Data Recovery is the most effective hard drive data recovery software which helps in retrieving data from the hard drive of personal computer, USB drive, external hard drive and any other device which you use for storing the data. If that's the case, move on to Step 3. It's ready to go right out of the box, simple as pie, and for me, I love how they both stand up like books and so take up much less room on my desk. You may add extra internal hard drives, if your Mac can accommodate them, or connect an external hard drive. Note: Some volumes can be verified but not repaired (e. Note: FireWire and USB hard drives (that is, external hard drives), even if their internal mechanism is S. First Aid Repairs File System Problems. Otherwise, continue to the next step. I updated WD Drive Utility and it can find the external hard drive, but says that it is "unmounted. When Apple's Disk First Aid (a feature of the Disk Utility) fails to fix a corrupted drive, turn to DiskWarrior. Click on the "Volumes" tab. " Disk Utility was unable to repair my drive and suggested I reformat the. On the top menu of the Disk Utility window you will see 'First Aid' (see screenshot above), click to run the check. I'm aware that Windows can do a better job at repairing exFAT drives so I was hoping to fix it in Windows, either with Windows own disk repair tool or third party software. Question: Q: First Aid failed on external hard drive, Time Machine backup I dropped my usb hard drive which is used for Time Machine backups tonight. You can calm down first, because if you see external hard drive greying out in Disk Utility, your external hard drive at least has no hardware errors. It would say all good, but the drive would NOT mount. Fix: The Disk You Inserted Was Not Readable by This Computer. First Aid will run and check out the possible errors on preferred disk. How to Make a Mac OS X Recovery Disk. 1 inserted into the floppy drive. If you have bootable drive with osx - if not make one- and on start up press cmd. Another great use of Disk Utility is to create disk images. ’ Just wait for the process to be completed patiently. However, the drive has clearly become corrupted - running first aid in Disk Utility throws up a 'could not read boot block - input / output error' along with some further info. DIY Repair Liquid Damage A1466 MacBook Air 13" Logic Board - No Power Efi Chip - Duration: 34:51. You didn't say which Mac you have, but if it supports Internet Recovery, then you can hold down ⌘-Option-R to force a boot into Interne. If it does, clone it up. At last, you will get three results generally after First Aid process. if you are using external drive, we would ask you to connect it to another usb port and check if the issue persists. However, I now have a 3TB drive that's failing on me. Secondly, Repair the unmounted Macintosh HD in recovery mode. If your issue has to do with wanting to know how to open a flash drive on Mac that’s displaying but not allowing you access to files, First Aid might be able to help. Now, open Disk Utility. I’m not surprised, considering that Apple shipped close to four million Macs in the first quarter of 2019 alone. It was originally in EX-FAT format, but I used Disk Utility to reformat as MacOS. Select it, select the "First Aid" tab, and click "Repair Disk". Click the First Aid button and then click the Repair Disk button ⑤. The default tool for formatting hard drives for a Mac is Disk Utility, which can be opened by typing “Disk Utility” in the Spotlight search bar in the top-right corner of your desktop or by locating it under Applications/Utility. Pop up window will ask to verify the erase procedure. Disk Utility does not provide as much information about a drive’s S. Disk Utility Use Disk Utility to check the status of your hard disk and make sure that you don't have a failing hard drive. Recently, I had a hard disk failure in my Pegasus R4 (first generation) RAID5-configured disk array. If you’ve even launched it at all, chances are you haven’t gone beyond using its First Aid features to repair a disk (see Mac OS X First Aid ). The Recovery HD has quite a few useful tools available such as Disk Utility, Safari, A Download Link for OS X and the option to Restore from a Time Machine Backup. After my reply to Lyman T on Aug 21, I went back to test Disk Utility on an external USB SSD drive formatted for APFS. Connect your USB or other external drive and open up disk utility. For more on the directory, visit: the Mac OS X directory FAQ. If possible back up the data on this volume. Alsoft's DiskWarrior is the hard. If you're trying on a Mac using Disk Utility to erase a hard drive and it won Have an external hard drive. Disk Utility is also a disk repair tool. If the drive has a file system not recognized by OS X, you'll need to erase it and the format it using FAT or HFS+. Further attempts to Erase have also failed. Repair Disk verifies and, if problems are found, corrects issues with the directory on. The drive plugs directly into my MacBook Pro 2015 15" running macOS 10. July 4, 2017 01. Select your startup disk, and click on the First Aid button. " I also do NOT have an option to repair my drive. Disk Utility - How to Format a Hard Drive as ExFat (Master Boot Record) for editing *Please note - there is a 2TB partition size limit for. I also ran self test with good results. So Disk Utility failed in exactly the same way when trying to run first aid. Repair your Drobo device with Disk Utility and then turn the journaling back on. ) If the drive partition(s) is still visible in the left column as the second indented row under the hard drive itself, but is not mounted on the Desktop, you can try to run a repair on the partition using Disk Utility’s First Aid function. Click Run, then click Continue. First try free and low cost techniques like connecting to another computer because the drive itself might not have been the component that crashed. Disk Utility Use Disk Utility to check the status of your hard disk and make sure that you don't have a failing hard drive. Although the utility is used to manage a crucial hardware. When I went to reinstall the OS, it asked for a disk to install it on and nothing would come up. I tested Drive 1 and got similar results. Note: in Mac OS X 10. July 1, 2018 Title 30 Mineral Resources Parts 1 to 199 Revised as of July 1, 2018 Containing a codification of documents of general applicability and future effect As of July 1, 2018. Top performing data recovery tools such as Stellar Phoenix, Eeasus, Mini-tool & Recuva can undelete data from your hard drive, USB, memory card or Android & IOS phone. Then follow the step by step tutorial below: On your Mac, go to Applications > Utilities >Disk Utility. Per the Pegasus R4/R6 Compatibilty List available on the Promise Technology site, I purchased the following compatible hard disk: Toshiba DT01ACA100, 1 TB, 6 Gb/s transfer rate, 64 MB buffer size, 7200 RPM. Other tools are applied to Volumes, like First Aid or Erase. Disclaimer: While performing chkdsk on the hard drive if any bad sectors are found on the hard drive when chkdsk tries to repair that sector if any data available on that might be lost. If your drive shows up here but isn't mounted, click Mount. If you are running Mac OS X version 10. Fix for disk erase failed couldn’t unmount disk. While most external drives connect via USB, some use FireWire, eSATA or Thunderbolt ports. Disk Utility is a program that handles all the repairs and formats of various types of storage devices, including hard drives but expanding outward to flash drives and other external devices. ⑤ Once in Recovery mode, you can select your startup drive and click Repair Drive (circled). Then, select “Show All Devices”. Disk Utility is unable to repair this at first, but the fix is this: Use diskutil list to find the right drive id. Click the First Aid button and then click the Repair Disk button ⑤. Think you have a specific problem with your internal drive or with external devices for storage? What you can do is to utilize the First Aid element of Disk Utility in order to check it. If that's the case, move on to Step 3. " A window will appear showing you various metrics related to your hard drive health, with things that are fine appearing in black, and things with problems appearing in red. Step 2: Select your external hard drive and then select first aid option. So Disk Utility failed in exactly the same way when trying to run first aid. The external hard drive works but makes a scratching noise. Disk Utility does not provide as much information about a drive’s S. I already tried repairing the disk in Disk Utility, and erasing it in Disk Utility, and it still won't mount.