9/16/2023 0 Comments Mac repair partition map![]() ![]() The USB drive is not recognized by the OS and does not appear in Finder.Here are some of the most common indicators of a corrupted USB drive. There are multiple signs that you may have a bad drive that requires you to recover corrupted files from USB on your Mac. In this way, you can determine if the drive is fine but the interface is the problem. If that is not an option, try connecting the device to another computer’s USB port. If your computer has more than one USB port, your first course of action should be to connect a USB device that is having issues to a different port. How do you know if your USB drive has been corrupted? Before looking at the signs that your USB drive is corrupted, let’s look at how to figure out if your USB port is broken on a MacBook or Mac computer. We will also look at things like how to format a corrupted USB drive on a Mac. We are going to show you how to retrieve files from a corrupted USB drive with your Mac. You may need to fix a corrupted USB drive on Mac or fix a broken USB device while saving its data. But like all disk-based storage devices, it can suffer data loss or corruption. Many people use them to share music or photo libraries with friends. So far, I haven't had any problems with about a week of starting / shutting down my MacBook connected to the offending drive (translation: I was going to return the drive, but the problem is clearly with Mac OS X Mountain Lion).USB drives are great for providing additional storage for your Mac or MacBook. If you prevent the drive from sleeping, whenever it's connected to the MacBook, then the above process doesn't occur and voila, the drive just works. Your only fix at that point is to re-partition / re-format and start over (which is big fun with 3TB of data to copy back on to the drive). Then, on the next boot-up, Mountain Lion tells you that it cannot repair the drive and it mounts as read only. ![]() ![]() That fails in some manner, leaving the drive 'corrupted' at the filesystem or partition level. You CANNOT ALLOW THE DRIVE TO SLEEP WHILE CONNECTED TO YOUR MAC.Īfter a lot of reading, here's what I think is happening: the drive goes to sleep, after some period of inactivity, and when you shutdown your Mac, OS X tries to write something to the drive as part of the dismount / disconnect / shutdown process. If you Google about, you will find a thread on Seagate's own support forum that describes how to disable the sleep function on the drive. So, I finally seemed to have resolved things with the Seagate 4TB Firewire external drive. I think Apple has finally released their own version of Vista. This was all new to Mountain Lion - man, I am sooooo sorry I upgraded to ML - this is one many serious problems I am having with ML (the others being Exchange support and external screen support w/ mission control). If I forget and leave the drives mounted (I have a 3TB model and a 4 TB model that are Firewire-chained), on a subsequent reboot the 4TB drive will report that it's unreadable and the fun starts over. One thing I've noticed is that if I explicitly unmount the drives, prior to shutdown, everything is fine. If I ignore this warning and copy a bunch of data on the disk, it eventually gets corrupted and I lose everything. I deleted the partition, recreated the partition as GUID Partition Table, HFS+ Journaled and the re-ran the verify from the top-level and see the same error - with no data on the disk (other than what's placed on there by Disk Utility). I am having the same issue with the Seagate GoFlex Desk 4TB Firewire 800 in a early 2011 MacBook Pro 17". ![]()
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