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When i plug in my usb stick it doesn't get mounted. So i check dmesg. There i could see that stick is getting connected initially but in a second its getting disconnected.

dmesg output:

[  734.488450] usb 3-7: new high-speed USB device number 6 using xhci_hcd
[  734.505175] usb 3-7: New USB device found, idVendor=0781, idProduct=5406
[  734.505182] usb 3-7: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  734.505185] usb 3-7: Product: U3 Cruzer Micro
[  734.505188] usb 3-7: Manufacturer: SanDisk
[  734.505190] usb 3-7: SerialNumber: 173971115603386C
[  734.505645] usb-storage 3-7:1.0: USB Mass Storage device detected
[  734.505718] scsi7 : usb-storage 3-7:1.0
[  735.053026] usb 3-7: USB disconnect, device number 6

fdisk -l shows only this:

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1   976773167   488386583+  ee  GPT

lsusb doesn't list my stick.

What could be the problem ?

On windows 7 it gives the error "Device driver is not properly installed".

Amit
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  • Does it work in another port? Does the same port take another USB stick? – Fabby Jan 31 '15 at 00:01
  • no it doesn't work in another port too. I tried different PCs but all in vain. and yes the same port takes another USB too. – Amit Feb 03 '15 at 04:41

1 Answers1

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Your USB stick is busted!

Sorry to be the harbinger of bad news and I hope you've got a back-up of the data it contains, but this is typical behaviour of a USB stick whose control circuit is broken...

If you have no backup: It looks like the control circuit is broken as it gets connected/disconnected/connected/disconnected/... Probably the memory chip itself is still OK, so if you have an identical disk, you repair the USB stick ;-) or take it to an electronics shop and have it repaired for you.

Warning: Repairing a USB stick will be much more expensive then just throwing it away and buying a new one! This is only to be attempted if it contains critical data.

It's always good to have a back-up of everything!

Community
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Fabby
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  • In latest portable HDDs they could be mounted again once they left not connected for few hours(>6h). Observed this in Transcend and Seagate 2TB Expansion. – minion91 Dec 02 '17 at 04:46
  • @ThilankaDeshan-minion91 HDD recovery is an entirely different animal. I put hose in the freezer overnight, then back-up a last time... – Fabby Dec 02 '17 at 21:25