ubuntu@ubuntu:~$ sudo dd if=/dev/sde count=1 | xxd
0000000: e9fd ffff ffff ffff ffff ffff ffff ffff  ................
0000010: ffff ffff ffff ffff ffff ffff ffff ffff  ................
0000020: ffff ffff ffff ffff ffff ffff ffff ffff  ................
0000030: ffff ffff ffff ffff ffff ffff ffff ffff  ................
0000040: ffff ffff ffff ffff ffff ffff ffff ffff  ................
0000050: ffff ffff ffff ffff ffff ffff ffff ffff  ................
0000060: ffff ffff ffff ffff ffff ffff ffff ffff  ................
0000070: ffff ffff ffff ffff ffff ffff ffff ffff  ................
0000080: ffff ffff ffff ffff ffff ffff ffff ffff  ................
0000090: ffff ffff ffff ffff ffff ffff ffff ffff  ................
00000a0: ffff ffff ffff ffff ffff ffff ffff ffff  ................
00000b0: ffff ffff ffff ffff ffff ffff ffff ffff  ................
00000c0: ffff ffff ffff ffff ffff ffff ffff ffff  ................
00000d0: ffff ffff ffff ffff ffff ffff ffff ffff  ................
00000e0: ffff ffff ffff ffff ffff ffff ffff ffff  ................
00000f0: ffff ffff ffff ffff ffff ffff ffff ffff  ................
0000100: ffff ffff ffff ffff ffff ffff ffff ffff  ................
0000110: ffff ffff ffff ffff ffff ffff ffff ffff  ................
0000120: ffff ffff ffff ffff ffff ffff ffff ffff  ................
0000130: ffff ffff ffff ffff ffff ffff ffff ffff  ................
0000140: ffff ffff ffff ffff ffff ffff ffff ffff  ................
0000150: ffff ffff ffff ffff ffff ffff ffff ffff  ................
0000160: ffff ffff ffff ffff ffff ffff ffff ffff  ................
0000170: ffff ffff ffff ffff ffff ffff ffff ffff  ................
0000180: ffff ffff ffff ffff ffff ffff ffff ffff  ................
0000190: ffff ffff ffff ffff ffff ffff ffff ffff  ................
00001a0: ffff ffff ffff ffff ffff ffff ffff ffff  ................
00001b0: ffff ffff ffff ffff ffff ffff ffff 0101  ................
00001c0: 0200 0b0d 4d30 4000 0000 00b0 0400 010d  ....M0@.........
00001d0: 4e30 0b00 0f41 40b0 0400 bf4f fb0f 0000  N0...A@....O....
00001e0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00001f0: 0000 0000 0000 0000 0000 0000 0000 55aa  ..............U.
1+0 records in
1+0 records out
512 bytes (512 B) copied, 2.46897 s, 0.2 kB/s