Mac Os X Check Usb Disk For Bad Sectors

Apr 17, 2013 - If you are familiar with Terminal, you can also use fsck to check filesystems. Disk Utility will not detect bad sectors, nor will fsck. With an internal hard drive that may be critical, but they won't get reported if they're on USB/FireWire drives. External hard disk was vanished after updating Mavericks OS! Use an Ubuntu disc that works with your Mac, then run badblocks with appropriate options. Ubuntu Manpage: badblocks - search a device for bad blocks click the heading for the full answer. Elsewhere in Stack Exchange. How to check whether there is bad sector on a USB harddisk on OS X? (2012-02-27) links to another related question.

• Print this page so you can refer to it later. (You don’t have access to the Disk Utility User Guide when you restart your computer in the next step.) In the Disk Utility User Guide window, click the Share button, then choose Print.

• Choose Apple menu > Restart. After your Mac restarts (some Mac computers play a startup sound), press and hold the Command and R keys until the Apple logo appears, then release the keys. • Click Disk Utility, then click Continue. Vmware player for mac elcapitan. • Choose View > Show All Devices. • In the sidebar, select the disk you want to repair.

• Click the First Aid button. If Disk Utility tells you the disk is about to fail, and replace the disk. You can’t repair it.

Otherwise, continue to the next step. If Disk Utility reports that the disk appears to be OK or has been repaired, you’re done. You can click Show Details to see more information about the repairs.

Otherwise, you may need to do one of the following. • If Disk Utility reports “overlapped extent allocation” errors, two or more files occupy the same space on your disk, and at least one of them is likely to be corrupted. You need to check each file in the list of affected files. Most of the files in the list have aliases in a DamagedFiles folder at the top level of your disk. • If you can replace a file or re-create it, delete it.

• If it contains information you need, open it and examine its data to make sure it hasn’t been corrupted. • If Disk Utility can’t repair your disk or it reports “The underlying task reported failure,” try to repair the disk or partition again. If that doesn’t work, back up as much of your data as possible, reformat the disk, reinstall macOS, then restore your backed-up data. If your Mac has a Fusion Drive and you see a flashing question mark or alert, see the troubleshooting section of the Apple Support article. If you continue to have problems with your disk or it can’t be repaired, it may be physically damaged and need to be replaced. For information about servicing your Mac, see.

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