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Accepted
Chris
Asked: 2010-05-12 06:21:32 +0800 CST

Refresh devices - reconnect CF card drive by script (unplug-plug equivalent)

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I plug a completely clean CF-card into my USB card-writer. Then I dd a mbr block of 512 bytes size to the device, which contains the partition table and the definition of one partition.

Problem: While "fdisk -l /dev/sdx" correctly displays the partition, it happens that there is no device like "/dev/sdx1" after these operations (as it was not present before). Unplugging and plugging the card-writer solves the problem and makes the device(s) appear. Since I use this procedure in a script, manually unplugging and re-plugging is no option whatsoever.

Is there a way to "refresh" the devices or to "unplug and re-plug" the drive by script such that /dev/sdx1 appears?

Thanks for any help,

Chris

linux bash usb-flash-drive

2 Answers

  1. Best Answer

    I think I found a solution:

    hdparm -z /dev/sdx

    seems to to the trick so far.

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  2. try partprobe. I don't know if it rereads external cards, but it did help me when I changed partitions on my local drives.

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