[gentoo-user] Re: USB SDHC Card Reader works, but only if mounted first in WinXP virtual machine

[Paul Hartman]

On Wed, Jul 28, 2010 at 9:37 AM, Paul Hartman
<paul.hartman+gentoo@×××××.com> wrote:
> Hi,
>
> I have a USB SDHC card reader whose partition table is not read, and
> device node not created, when plugged into my Gentoo Linux computer. I
> posted about this a year or two ago but was never able to get it
> working, until I recently made an accidental discovery:
>
> If I let a VMWare WinXP take control of the USB device, on the same
> physical linux machine as above, the card reader mounts normally in
> the virtual WinXP. Then, if I release the USB device from VMware,
> Linux takes control of the device back and can read the partition
> table and creates the device node normally. After that everything
> works fine, I can copy files to/from etc. and everything seems normal.

BradN on the Forums suggested "hdparm -z" to force the kernel to
re-read the partition table, and this works. Much easier than using a
virtual machine!