<div class="gmail_quote"> 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. <a href="http://tinyurl.com/ycueutm" target="_blank"></a> </div> -- Alok Singh Mahor CSE, IIT Delhi <a href="http://www.alokmahor.tk">www.alokmahor.tk</a> Join the next generation of computing, Open Source, and Linux/GNU!