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Disk repair utility for mac os x install#
Disk repair utility for mac os x software#

Once this is completed, click Done If you would like more info about the state of your before first aid was run, click Show Details.

(Note: If after doing this a second dialog box appears saying "First Aid needs to temporarily lock the boot volume" Click Continue

When prompted if you would like to run First Aid, click run.

Select the Hard Drive you would like to check from the list of volumes.

Open Disk Utility, which is in the Utilities folder within your applications folder.

Repairing Disk Permissions with First Aid on OS X El Capitan and aboveįollow these steps in OS X El Capitan or above: You can use first aid to do this manually for external hard drives. Beginning with OS X El Capitan, system file permissions are automatically protected, It's no longer necessary to verify or repair permissions with Disk Utility on OS X El Capitan and above, as this is done routinely on the start up disk. In OS X Yosemite and earlier, Disk Utility can be used to Verify and Repair disk permissions. You can see a file or folder's permissions in the Sharing & Permissions section of its Get Info window.

Disk repair utility for mac os x software#

If a file's permissions are no longer set correctly, software that uses the file (such as Serato DJ) might not work correctly. Try running First Aid on the disk and then retry mounting."Īt this point I am hesitant to proceed without some reassurances.Permissions are file settings that affect the ability to read, write, or execute (open or run) the file. "Mount failed: The disk 'PROMISE PEGASUS' could not be mounted. Disk Utility reported the following error: Next, I ran Apple's Disk Utility application, selected the 'PROMISE PEGAGUS' volume, and clicked on the 'Mount' button at the top of the Disk Utilitiy application window.

Reinstall Mac OX S, when prompt to select disk for installation, there is no disk.

Disk repair utility for mac os x install#

Go back to the macOS utility screen and select install MacOS. As I suspected this was not the cause, since I have other external drives that are mounted and reported on the desktop. Select and make sure it is in Mac OS Extended (Journaled) format. Of course, I first tried checking Finder Preferences to ensure the 'external disks' option was checked.

Unfortunately, my Macbook Pro's OS no longer 'sees' the Pegasus R4 logical disk drive it does not appear on the desktop. After the drive failed and up this point, where I replaced it, I made no attempt to execute neither read nor write operatoins on the disk array, even though I was informed that read operations are safe.Īfter installing the replacement disk drive, I ran the Promise Utility application, and the dashboard reported green in every dashboard item listed under 'System Status'.

With RAID5 in a 4-disk configuration, one drive can fail without the impact of data loss. Promise Technology confirmed that I would incur no data loss, since the disk array is set up with RAID5 and that the rebuild process would populate the replacement hard drive with the RAID5 parity bit data necessary for data redundancy. Once Installed I went through the process of manually rebuidling the replacement drive. Since I used a hard disk on the compability list, I felt confident that no issue would arise after replacing the failed disk drive.

Promise Technology informed me that mixing and matching drives from different manufacturers and with (potentially) different buffer sizes has no impact on the Pegasus R4's ability to function properly. It replaces the original Hitachi HDS721010DLE630, 1 TB, 6 Gb/s transfer rate, 64(?) MB buffer size, 7200 RPM disk drive. Toshiba DT01ACA100, 1 TB, 6 Gb/s transfer rate, 64 MB buffer size, 7200 RPM Per the Pegasus R4/R6 Compatibilty List available on the Promise Technology site, I purchased the following compatible hard disk: Recently, I had a hard disk failure in my Pegasus R4 (first generation) RAID5-configured disk array.