please advice. here is sample of result get view disk hex with xxd in terminal. thanks.
Output:00000000: 0000 0000 0000 0000 dddd dddd dddd dddd ................
00000010: 0000 0000 0000 0010 dddd dddd dddd dddd ................
00000020: 0000 0000 0000 0020 dddd dddd dddd dddd ....... ........
00000030: 0000 0000 0000 0030 dddd dddd dddd dddd .......0........
00000040: 0000 0000 0000 0040 dddd dddd dddd dddd .......@........
00000050: 0000 0000 0000 0050 dddd dddd dddd dddd .......P........
00000060: 0000 0000 0000 0060 dddd dddd dddd dddd .......`........
00000070: 0000 0000 0000 0070 dddd dddd dddd dddd .......p........
00000080: 0000 0000 0000 0080 dddd dddd dddd dddd ................
00000090: 0000 0000 0000 0090 dddd dddd dddd dddd ................
000000a0: 0000 0000 0000 00a0 dddd dddd dddd dddd ................
000000b0: 0000 0000 0000 00b0 dddd dddd dddd dddd ................