[colug-432] OT: OSX mysterious disk

[philip farris]

Hello All,

I have seen something VERY similar and  would guess your external (500 GB)
is corrupted, failing, dying, etc and causing the mystery 2.2tb to show up.
I would make sure all information on it is backed up.

FiL

On Thu, Mar 10, 2011 at 3:33 PM, <jep200404 at columbus.rr.com> wrote:

> On Thu, 10 Mar 2011 14:02:26 -0600, Richard Hornsby <
> richardjhornsby at gmail.com> wrote:
>
> > brw-r-----  1 rhornsby  operator   14,   5 Mar 10 13:37 /dev/disk2
>
> What do the following reveal?
>
>   fdisk -l /dev/disk2
>   dd if=/dev/disk2 | xxd -g 1 -u | less
>   dd if=/dev/disk2 | strings | less
>   dd if=/dev/disk2 | strings -n 8 | less
>
> > USB to ATA/ATAPI Bridge:
> >
> >   Capacity:   2.2 TB (2,199,023,255,552 bytes)
>
> That's a curious number. It is exactly (2^32) 512 byte sectors.
> IIRC (2^32) sectors is the maximum size for LBA32 drives and
> controllers[1]. My guess is that it's also the maximum size for
> USB mass storage devices.
>
> >   Product ID: 0x2338
> >   Vendor ID:  0x152d  (JMicron Technology Corp.)
>
> I would start paying attention to the vendor and product ID more.
> What have found about these when you search the web?
> Does it match that of any other thing in your computer?
> Unplug each one USB thing at a time,
> then run lsusb and look for anything interesting.
> Could it be on the motherboard?
>
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