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After trying to install bootcamp I had an error. After this my USB drive is no longer recognized. It still appears in system report. If I connect it to Windows it tells me that the device is not recognized.

I tried a lot of things:

  • reset smc
  • reset nvram
  • lists with disk utils

How can I repair the usb drive?

c

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  • If Windows also sees an error, I'd wager the USB itself is defective - does it work on another computer?
    – QuickishFM
    Mar 23, 2020 at 22:01
  • was working fine, it only stopped working when bootcamp had a problem and all the partitions disappeared
    – Cristyan
    Mar 24, 2020 at 14:48

2 Answers 2

Reset to default
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remove your USB and try this in terminal:
diskutil list
now note the list, insert your USB and run another command : ls -al /dev/ | grep disk
a new disk name is added. something like "disk1s1". it is your flash drive.
now you just need to mount it in terminal by it's name. here my device is disk1a1:
diskutil mount -mountPoint /Volumes/ /dev/disk1s1

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  • I tried to do this but it didn't work: > ls -al /dev/ | grep disk brw-r----- 1 root operator 1, 0 Mar 23 19:50 disk0 brw-r----- 1 root operator 1, 1 Mar 23 19:50 disk0s1 brw-r----- 1 root operator 1, 2 Mar 23 19:50 disk0s2 brw-r----- 1 root operator 1, 3 Mar 23 19:50 disk1 brw-r----- 1 root operator 1, 4 Mar 23 19:50 disk1s1 brw-r----- 1 root operator 1, 5 Mar 23 19:50 disk1s2
    – Cristyan
    Mar 24, 2020 at 15:27
  • send the result of first command too, pls
    – H. Far
    Mar 24, 2020 at 15:34
  • thanks gist.github.com/cristyansv/131cb4ea8d76487ebe68d31e4137515e
    – Cristyan
    Mar 24, 2020 at 15:36
  • ok, open your Disk Utility on mac , if you can see your Device select it and click on first aid. if it didn't work, your USB is damaged.
    – H. Far
    Mar 24, 2020 at 15:43
  • Thanks, it definitely doesn't work.
    – Cristyan
    Mar 24, 2020 at 15:51
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Are you willing to re-format the USB drive? You will lose any data on the drive but it may repair it. If you have important files on the USB drive, then ignore this answer ;)

If using Windows to perform the format I recommend UNCHECKING the box that says "Quick Format" (other OS's may have a similar option). This takes longer but will make Windows perform a more thorough format.

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