[clug] USB sticks with two drives

Robert Edwards bob at cs.anu.edu.au
Sun Jun 23 18:41:29 MDT 2013

On 24/06/13 07:20, Craig Small wrote:
> Hi All,
>    I came across a strange thing with one of my USB sticks.  It was one
> given to me so its not like I was expecting one thing and got another.
> When I plug it into my computer, I get two drives (not partitions, but
> sdc and sdd) with different USB IDs appearing.
> Anyone seen this before? I've not heard of it.  Not even sure why you'd
> bother given the small size of them.
> Jun 24 07:11:38 elmo kernel: [4567724.692085] sd 9:0:0:0: [sdc] 161792
> 512-byte logical blocks: (82.8 MB/79.0 MiB)
> Jun 24 07:11:38 elmo kernel: [4567724.692445] sd 9:0:0:1: [sdd] 94208
> 512-byte logical blocks: (48.2 MB/46.0 MiB)
>   - Craig

ANU Marketing issued many "1GB" USB Flash drives some 5 years (or
more) ago, which enumerated as two separate block devices.

The first is a "1GB" (read 1x10^9 bytes) device for general purpose
use and the second is a 7.6MB device that contained their marketing
info (some PDF files etc.). I have several of them.

The second device is write-protected in some simple fashion, but I
never did figure out if it was possible to "re-format" (so to speak)
the two into a single device (I would only win an extra 7.6MB per
stick, which is only 100 North-star formatted 5.25" floppy disks...,
but I am possibly digressing).


Bob Edwards.

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