UNIX系ではHDDも所詮ファイル扱いなので、以下で可能。
[root@localhost ~]# hexdump -C -n 512 /dev/sda 00000000 eb 48 90 10 8e d0 bc 00 b0 b8 00 00 8e d8 8e c0 |.H..............| 00000010 fb be 00 7c bf 00 06 b9 00 02 f3 a4 ea 21 06 00 |...|.........!..| 00000020 00 be be 07 38 04 75 0b 83 c6 10 81 fe fe 07 75 |....8.u........u| 00000030 f3 eb 16 b4 02 b0 01 bb 00 7c b2 80 8a 74 03 02 |.........|...t..| 00000040 81 00 00 80 41 b4 00 00 00 08 fa 90 90 f6 c2 80 |....A...........| 00000050 75 02 b2 80 ea 59 7c 00 00 31 c0 8e d8 8e d0 bc |u....Y|..1......| 00000060 00 20 fb a0 40 7c 3c ff 74 02 88 c2 52 be 7f 7d |. ..@|<.t...R..}| 00000070 e8 34 01 f6 c2 80 74 54 b4 41 bb aa 55 cd 13 5a |.4....tT.A..U..Z| 00000080 52 72 49 81 fb 55 aa 75 43 a0 41 7c 84 c0 75 05 |RrI..U.uC.A|..u.| 00000090 83 e1 01 74 37 66 8b 4c 10 be 05 7c c6 44 ff 01 |...t7f.L...|.D..| 000000a0 66 8b 1e 44 7c c7 04 10 00 c7 44 02 01 00 66 89 |f..D|.....D...f.| 000000b0 5c 08 c7 44 06 00 70 66 31 c0 89 44 04 66 89 44 |\..D..pf1..D.f.D| 000000c0 0c b4 42 cd 13 72 05 bb 00 70 eb 7d b4 08 cd 13 |..B..r...p.}....| 000000d0 73 0a f6 c2 80 0f 84 ea 00 e9 8d 00 be 05 7c c6 |s.............|.| 000000e0 44 ff 00 66 31 c0 88 f0 40 66 89 44 04 31 d2 88 |D..f1...@f.D.1..| 000000f0 ca c1 e2 02 88 e8 88 f4 40 89 44 08 31 c0 88 d0 |........@.D.1...| 00000100 c0 e8 02 66 89 04 66 a1 44 7c 66 31 d2 66 f7 34 |...f..f.D|f1.f.4| 00000110 88 54 0a 66 31 d2 66 f7 74 04 88 54 0b 89 44 0c |.T.f1.f.t..T..D.| 00000120 3b 44 08 7d 3c 8a 54 0d c0 e2 06 8a 4c 0a fe c1 |;D.}<.T.....L...| 00000130 08 d1 8a 6c 0c 5a 8a 74 0b bb 00 70 8e c3 31 db |...l.Z.t...p..1.| 00000140 b8 01 02 cd 13 72 2a 8c c3 8e 06 48 7c 60 1e b9 |.....r*....H|`..| 00000150 00 01 8e db 31 f6 31 ff fc f3 a5 1f 61 ff 26 42 |....1.1.....a.&B| 00000160 7c be 85 7d e8 40 00 eb 0e be 8a 7d e8 38 00 eb ||..}.@.....}.8..| 00000170 06 be 94 7d e8 30 00 be 99 7d e8 2a 00 eb fe 47 |...}.0...}.*...G| 00000180 52 55 42 20 00 47 65 6f 6d 00 48 61 72 64 20 44 |RUB .Geom.Hard D| 00000190 69 73 6b 00 52 65 61 64 00 20 45 72 72 6f 72 00 |isk.Read. Error.| 000001a0 bb 01 00 b4 0e cd 10 ac 3c 00 75 f4 c3 00 00 00 |........<.u.....| 000001b0 00 00 00 00 00 00 00 00 9b ef 0e 00 00 00 80 01 |................| 000001c0 01 00 83 fe 3f 20 3f 00 00 00 a2 16 08 00 00 00 |....? ?.........| 000001d0 01 21 83 fe ff ff e1 16 08 00 d9 e5 3f 01 00 fe |.!..........?...| 000001e0 ff ff 82 fe ff ff ba fc 47 01 c5 fa 3f 00 00 fe |........G...?...| 000001f0 ff ff 0f fe ff ff 00 00 88 01 00 00 b8 00 55 aa |..............U.| 00000200 [root@localhost ~]#
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