Unexpected bios behavior??? due to connection of an external drive.

[jd1008]

On 03/17/2015 06:19 PM, Chris Murphy wrote:
> dd if=/dev/sdX count=1 2>/dev/null | hexdump -C
# dd if=/dev/sdb bs=440 count=1   2>/dev/null | hexdump -C
00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  
|................|
*
000001b0  00 00 00 00 00 00 00 00                           |........|
000001b8


# dd if=/dev/sdb bs=4b count=1 2>/dev/null | hexdump -C
00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  
|................|
*
000001b0  00 00 00 00 00 00 00 00  3b 00 c5 1b 00 00 00 00  
|........;.......|
000001c0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  
|................|
000001d0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 20  
|............... |
000001e0  21 00 83 fe ff ff 00 08  00 00 af 80 e0 e7 00 fe  
|!...............|
000001f0  ff ff 82 fe ff ff 1e 18  e1 e7 91 70 ff 00 55 aa  
|...........p..U.|
00000200  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  
|................|
*
00000800


By the way, partition 1 starts at 2048 sectors (512 bytes sectors) offset.