![]() ![]() Once Disk Utility has loaded, choose the disk you wish to repair - the default name for your system partition is generally "Macintosh HD", and choose 'Repair Disk'. Select Disk Utility from the macOS Utilities menu.Restart your Mac, and press Command + R, while it's restarting.If trying to repair the internal partition where your Operating System is installed, you'll need to boot into Recovery mode, so your Mac can check and repair files that are "in use".If using an external disk, then choose 'Repair Disk', and allow the process to complete.Set Volume label and File system and check the option Perform a quick format. Right-click the corrupted USB drive and select Format. It should give you some diagnosis to confirm whether your drive is viable, or needs to be repaired. ( If you cannot open your USB drive in Windows 7, you can click My Computer.) Choose Manage, and then click Disk Management. Click a user or group in the Name column, then choose a privilege setting from the pop-up menu. If the lock at the bottom right is locked, click it to unlock the Get Info options, then enter an administrator name and password. If the information in Sharing & Permissions isn’t visible, click the arrow. Once you've loaded Disk Utility, select 'Verify Disk' and allow your Mac to check the disk. On your Mac, select a disk, folder, or file, then choose File > Get Info. ![]() You can locate Disk Utility within your Applications -> Utilities folder, or by searching "Disk Utility" in Spotlight. ![]() This requires the computer to be booted in Recovery mode, and as repairing the internal partition can have serious repercussions, we advise performing a back-up of any crucial data before proceeding. It can also be used on your internal partition if you are having trouble with OS X. The most obvious example would be when there is drive corruption caused by improperly removing external USB storage. Note that this doesn’t apply to read/write disk images, as they don’t store checksums. When you open and mount it, macOS checks that checksum. Repairing Disks using OS X's Disk Utility can be a useful way to improve performance, and in some scenarios, recover lost data. If the disk image is read-only (as are most installers and apps supplied on disk images) or compressed, when it’s saved it includes a checksum of its entire contents. As much a we all try to protect our computers, sometimes issues do arise with the drives where you store your data. ![]()
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