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A familiy member asked me if I could look at a USB flash drive with valuable content that "didn't work on the Mac". Thought I could try it on my Linux machine with more tools to work with. But I can't get anything out of it. Not listed in fdisk -l, not listed in blkid. However I do find traces of it with dmesg:

[    0.829225] xhci_hcd 0000:00:14.0: xHCI Host Controller
[    0.829230] xhci_hcd 0000:00:14.0: new USB bus registered, assigned bus number 1
[    0.830380] xhci_hcd 0000:00:14.0: hcc params 0x200077c1 hci version 0x100 quirks 0x00109810
[    0.830385] xhci_hcd 0000:00:14.0: cache line size of 64 is not supported
[    0.836824] xhci_hcd 0000:00:14.0: xHCI Host Controller
[    0.836826] xhci_hcd 0000:00:14.0: new USB bus registered, assigned bus number 2
[    1.211540] usb 1-2: new high-speed USB device number 2 using xhci_hcd
[    1.568206] usb 1-5: new high-speed USB device number 3 using xhci_hcd
[    1.968193] usb 1-7: new full-speed USB device number 4 using xhci_hcd
[  141.038788] usb 1-2: reset high-speed USB device number 2 using xhci_hcd
[  141.528193] usb 1-2: new high-speed USB device number 5 using xhci_hcd

But I don't know where to go from here, or if this info is useful at all. Searched the web, but I am stuck. Any help is greatly appreciated.

I should add that they said they used some program on the MacBook to write to the disk. Not a conventional file manager.

closed as off-topic by Rui F Ribeiro, GAD3R, phk, roaima, Gilles May 21 '17 at 21:18

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  • The fact the controller is still alive might be more bad news than good... also, often due to mechanical abuse (bending), it is fairly common for the controller to be separated from the rest of the device in a broken stick. Open it, it is good as dead anyway. – Rui F Ribeiro May 21 '17 at 12:35
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    I'm voting to close this question as off-topic because this is a hardware problem that wont be fixed with Linux commands. – Rui F Ribeiro May 21 '17 at 12:37
  • Why the assumption it is a hardware problem? It is a fairly new device, with little visible wear. – E. l4d3 May 21 '17 at 12:44
  • They are two separate wafers the controller and the actual memory which do not take much physical trauma to separate..my daughter-in-law already killed two of them in that way. – Rui F Ribeiro May 21 '17 at 12:48
  • "they used some program on the MacBook". Any clues what the program might be, please. – roaima May 21 '17 at 18:34