[plug] Missing storage space

[Jim Householder]

Hi

In order to make my laptop a little less accessible to the casual snoop 
I have made a 256MB USBKey mount automatically during booting.  Works 
fine.  If missing the only access is for root to fix the problem. 
Initially I thought to put /home on it, but then decided that the write 
life of the device would not be up to it.  As I only have 230MB free on 
hda I will put less volatile data on it.

The numbers df gives me for it do not appear consistent.  I get
/dev/sda1  245409  2062  230676  1%  /media/removable

Now I expect the 245409 since manufacturers and computers use different 
definitions of MB.  However I would expect total to equal used + 
available.  What happened to the missing 12671 blocks?  Filesystem 
overhead perhaps?

TIA
Jim