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    SubjectRe: Problems with USB disk
    On Tue, Aug 07, 2007 at 10:26:15PM +0200, Niels wrote:
    > Hi,
    >
    > I'm having problems with a new 500 GB USB disk. It works, but sometimes I
    > get these in dmesg:
    >
    >
    > usb 1-3: reset high speed USB device using ehci_hcd and address 2
    > usb 5-1: USB disconnect, address 2
    > drivers/usb/class/usblp.c: usblp0: removed
    > sd 0:0:0:0: Device not ready: <6>: Sense Key : 0x2 [current]
    > : ASC=0x4 ASCQ=0x2
    > end_request: I/O error, dev sda, sector 254148215
    > sd 0:0:0:0: Device not ready: <6>: Sense Key : 0x2 [current]
    > : ASC=0x4 ASCQ=0x2
    > end_request: I/O error, dev sda, sector 252434023
    > EXT3-fs error (device sda1): ext3_find_entry: reading directory #15761836
    > offset 0
    >
    >
    > There's also a printer connected. This is on a pci/usb2 card. When the above
    > happens, I get I/O errors. When I mount the drive next, there are errors
    > and often missing files. Quite annoying!
    >
    > Kernel is 2.6.21
    >
    > What's going on?

    You have a low voltage issue, or a bad cable. The device is
    electronically disconnecting itself. Try using a externally-powered
    hub, or a new cable.

    thanks,

    greg k-h
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