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The mysterious 8MB block device on Linux

If you ever notice a device like that on your Linux system:

# fdisk -l
Disk /dev/sda: 8 MB, 8388608 bytes
8 heads, 32 sectors/track, 64 cylinders
Units = cylinders of 256 * 512 = 131072 bytes

Disk /dev/sda doesn't contain a valid partition table

… then the scsi_debug kernel driver is present. To get rid of the device either unload the driver or (if e.g. statically compiled into the kernel) use sysfs, like:

# echo -1 > /sys/bus/pseudo/drivers/scsi_debug/add_host

Further details available at http://sg.danny.cz/sg/sdebug26.html.

This entry was posted by mika on Thursday, February 4th, 2010 at 14:57 and is filed under Computer, English. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.

One Response to “The mysterious 8MB block device on Linux”

  1. Matt Simmons Says:
    February 4th, 2010 at 16:16

    Interesting! I haven’t had this happen, but now if I do, I’ll remember this entry and come back for the fix. thanks!