Re: usb mass storage
From: Daniel Miller (dan_at_invalid.com)
Date: 08/05/04
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Date: 5 Aug 2004 13:45:11 -0500
mcintosh@nospam.com (Allen McIntosh) wrote in
news:ceott8$11n$1@mc-pc.research.telcordia.com:
> Just one thing to add: based on a recent google search (when I was
> having problems with my USB memory) there may not be a partition
> table. This means the memory should be accessed as /dev/sdb etc.
> Clues:
> - if there is a valid partition table, the last two bytes of the first
> 512 byte sector should be 0x55 and 0xaa.
Oops... this test is no good!! USB devices may have either a partition
table (like a HDD) or a boot sector (like a FDD) at sector 0. Either type
of sector ends with 0x55AA !!! Unfortunately, at least with kernel 2.4,
linux doesn't understand a USB device with a boot sector, which is why
fdisk sometimes shows absurd values.
> - if the results of fdisk -l are totally off the wall (4 partitions
> with weird types) then there may not be any partition table.
>
> Either way I'd suggest mounting the device read-only until you are
> sure.
>
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