[ubuntu-in] External USB hard disk not recognised after a power failure during operation

[Alok Singh Mahor]

I am using Ubuntu 10.04 and win XP.

While I was playing some songs from my HD on windows  suddent power
got disconnected from my HD. When I plug it again it was not
recognised(on windows). Actually windows even doesn't boot while HD is
plugged in.

Then I came to Ubuntu(usb still plugged in) but again Ubuntu was
taking a lot of time for booting, then I unplugged HD and system
booted normally. Then I plugged HD again but it was not recognized.

After that I tried few commands:

lsusb:
It doesn't give any output when HD is plugged in.

When plugged out lsusb gives normal output.

Here are the last few lines of the command 'dmesg' which I think is
showing some errors
****************************************
[  271.592137] usb 1-1: new high speed USB device using ehci_hcd and
address 14
[  276.612302] usb 1-1: device descriptor read/8, error -110
[  281.732305] usb 1-1: device descriptor read/8, error -110
[  281.948161] usb 1-1: new high speed USB device using ehci_hcd and
address 15
[  286.968302] usb 1-1: device descriptor read/8, error -110
[  292.088306] usb 1-1: device descriptor read/8, error -110
[  292.192166] hub 1-0:1.0: unable to enumerate USB device on port 1
[  292.460163] usb 2-1: new full speed USB device using uhci_hcd and
address 2
[  307.572143] usb 2-1: device descriptor read/64, error -110
[  322.788086] usb 2-1: device descriptor read/64, error -110
[  323.004171] usb 2-1: new full speed USB device using uhci_hcd and
address 3
[  335.779414] ADDRCONF(NETDEV_UP): eth0: link is not ready
[  335.780398] e100: eth0 NIC Link is Up 10 Mbps Full Duplex
[  335.781854] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[  338.116126] usb 2-1: device descriptor read/64, error -110
[  353.332130] usb 2-1: device descriptor read/64, error -110
[  353.548123] usb 2-1: new full speed USB device using uhci_hcd and
address 4
[  358.569288] usb 2-1: device descriptor read/8, error -110
[  363.689282] usb 2-1: device descriptor read/8, error -110
[  363.904192] usb 2-1: new full speed USB device using uhci_hcd and
address 5
[  368.926285] usb 2-1: device descriptor read/8, error -110
[  374.045330] usb 2-1: device descriptor read/8, error -110
[  374.148155] hub 2-0:1.0: unable to enumerate USB device on port 1
[  885.124101] usb 2-1: new full speed USB device using uhci_hcd and
address 6
[  899.052171] hub 2-0:1.0: unable to enumerate USB device on port 1
[  907.060161] usb 1-1: new high speed USB device using ehci_hcd and
address 16
[  922.172143] usb 1-1: device descriptor read/64, error -110
[  937.388120] usb 1-1: device descriptor read/64, error -110
[  937.604146] usb 1-1: new high speed USB device using ehci_hcd and
address 17
[  942.736400] hub 1-0:1.0: unable to enumerate USB device on port 1
[  994.604132] usb 1-1: new high speed USB device using ehci_hcd and
address 18
[ 1009.720155] usb 1-1: device descriptor read/64, error -110
[ 1024.936085] usb 1-1: device descriptor read/64, error -110
[ 1025.152147] usb 1-1: new high speed USB device using ehci_hcd and
address 19
[ 1040.264165] usb 1-1: device descriptor read/64, error -110
[ 1044.568405] hub 1-0:1.0: unable to enumerate USB device on port 1
[ 1295.240248] usb 1-1: new high speed USB device using ehci_hcd and
address 20

*****************************************

If somebody has any idea where to go from here, please send your
suggestions.

 <http://tinyurl.com/ycueutm>



-- 
Alok Singh Mahor
CSE, IIT Delhi
www.alokmahor.tk

Join the next generation of computing, Open Source, and Linux/GNU!
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