[colug-432] OT: OSX mysterious disk

[jep200404 at columbus.rr.com]

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?