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[all variants] HD problem: "Device offlined - not ready after error recovery"

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linux-howto

http://ubuntuforums.org – Greetings, I have a problem with one of my external hard disks. Since today, any sort of I/O from/to the disk stops occasionally. When powering off the hard disk and reconnecting it, it works again. There are ten-thousands of messages in my syslog, like the following: Code: Apr  6 17:26:19 MintX kernel: [ 3506.270049] usb 2-3: reset high speed USB device using ehci_hcd and address 3 Apr  6 17:26:19 MintX kernel: [ 3506.421098] sd 9:0:0:0: Device offlined - not ready after error recovery Apr  6 17:26:19 MintX kernel: [ 3506.421114] sd 9:0:0:0: [sdk] Unhandled error code Ap (Hardware)