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Currently I'm using 1TB of SanDisk Proportable SSD. Actually, this SSD had a lot of problems.

At first, it was used as exFAT, but an unrecognized situation occurred on the Mac, so it was recovered through the command CHKDISK using a Windows computer, and then changed to APFS. In the meantime, the error occurred again: "The attached disk cannot be read from this computer" and it does not connect.

It was not even repaired, so I forced the terminal to mount it, but it didn't work.

How can you use this drive without data loss?

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When connected, the attached disk appears as unreadable on this computer:

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The current situation is that disk2 should have about 500GB of data, but it is not visible:

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I tried to force mount but it doesn't work:

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It doesn't even test/recover.

I want to be able to solve it well without data loss.

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  • The error “cannot be read” means that however it was formatted, macOS doesn’t recognize it. The fact you said it was “converted to APFS” indicates it worked for a short time on a Mac then failed again. Your drive controller on the USB drive probably failed.
    – Allan
    Commented Jun 13, 2023 at 14:07
  • Does it mean that the format is the only answer if the USB drive is it correct?
    – LEE
    Commented Jun 14, 2023 at 0:54
  • I’m not clear what you mean by that.
    – Allan
    Commented Jun 14, 2023 at 0:56
  • Is there any way to fix the usb drive controller?
    – LEE
    Commented Jun 14, 2023 at 0:59
  • The easiest would be to get a new enclosure and swap the drive. However, it’s probably easier and cheaper to buy a new drive.
    – Allan
    Commented Jun 14, 2023 at 0:59

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