[root@nixos:~]# hexdump -C /dev/sda | head -n50
00000000  eb 63 90 d0 bc 00 7c 8e  c0 8e d8 be 00 7c bf 00  |.c....|......|..|
00000010  06 b9 00 02 fc f3 a4 50  68 1c 06 cb fb b9 04 00  |.......Ph.......|
00000020  bd be 07 80 7e 00 00 7c  0b 0f 85 0e 01 83 c5 10  |....~..|........|
00000030  e2 f1 cd 18 88 56 00 55  c6 46 11 05 c6 46 10 00  |.....V.U.F...F..|
00000040  b4 41 bb aa 55 cd 13 5d  72 0f 81 fb 55 aa 75 09  |.A..U..]r...U.u.|
00000050  f7 c1 01 00 74 03 fe 46  10 66 00 80 01 00 00 00  |....t..F.f......|
00000060  00 00 00 00 ff fa 90 90  f6 c2 80 74 05 f6 c2 70  |...........t...p|
00000070  74 02 b2 80 ea 79 7c 00  00 31 c0 8e d8 8e d0 bc  |t....y|..1......|
00000080  00 20 fb a0 64 7c 3c ff  74 02 88 c2 52 be 80 7d  |. ..d|<.t...R..}|
00000090  e8 17 01 be 05 7c b4 41  bb aa 55 cd 13 5a 52 72  |.....|.A..U..ZRr|
000000a0  3d 81 fb 55 aa 75 37 83  e1 01 74 32 31 c0 89 44  |=..U.u7...t21..D|
000000b0  04 40 88 44 ff 89 44 02  c7 04 10 00 66 8b 1e 5c  |.@.D..D.....f..\|
000000c0  7c 66 89 5c 08 66 8b 1e  60 7c 66 89 5c 0c c7 44  ||f.\.f..`|f.\..D|
000000d0  06 00 70 b4 42 cd 13 72  05 bb 00 70 eb 76 b4 08  |..p.B..r...p.v..|
000000e0  cd 13 73 0d 5a 84 d2 0f  83 d8 00 be 8b 7d e9 82  |..s.Z........}..|
000000f0  00 66 0f b6 c6 88 64 ff  40 66 89 44 04 0f b6 d1  |.f....d.@f.D....|
00000100  c1 e2 02 88 e8 88 f4 40  89 44 08 0f b6 c2 c0 e8  |.......@.D......|
00000110  02 66 89 04 66 a1 60 7c  66 09 c0 75 4e 66 a1 5c  |.f..f.`|f..uNf.\|
00000120  7c 66 31 d2 66 f7 34 88  d1 31 d2 66 f7 74 04 3b  ||f1.f.4..1.f.t.;|
00000130  44 08 7d 37 fe c1 88 c5  30 c0 c1 e8 02 08 c1 88  |D.}7....0.......|
00000140  d0 5a 88 c6 bb 00 70 8e  c3 31 db b8 01 02 cd 13  |.Z....p..1......|
00000150  72 1e 8c c3 60 1e b9 00  01 8e db 31 f6 bf 00 80  |r...`......1....|
00000160  8e c6 fc f3 a5 1f 61 ff  26 5a 7c be 86 7d eb 03  |......a.&Z|..}..|
00000170  be 95 7d e8 34 00 be 9a  7d e8 2e 00 cd 18 eb fe  |..}.4...}.......|
00000180  47 52 55 42 20 00 47 65  6f 6d 00 48 61 72 64 20  |GRUB .Geom.Hard |
00000190  44 69 73 6b 00 52 65 61  64 00 20 45 72 72 6f 72  |Disk.Read. Error|
000001a0  0d 0a 00 bb 01 00 b4 0e  cd 10 ac 3c 00 75 f4 c3  |...........<.u..|
000001b0  00 00 00 00 00 00 00 00  c2 f6 df 05 00 00 00 20  |............... |
000001c0  21 00 83 9f 06 19 00 08  00 00 00 40 06 00 00 9f  |!..........@....|
000001d0  07 19 82 fe ff ff 00 48  06 00 00 40 19 01 00 fe  |.......H...@....|
000001e0  ff ff 83 fe ff ff 00 88  1f 01 00 d8 18 39 00 00  |.............9..|
000001f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 55 aa  |..............U.|
00000200  52 56 be 1b 81 e8 39 01  5e bf f4 81 66 8b 2d 83  |RV....9.^...f.-.|
00000210  7d 08 00 0f 84 e2 00 80  7c ff 00 74 46 66 8b 1d  |}.......|..tFf..|
00000220  66 8b 4d 04 66 31 c0 b0  7f 39 45 08 7f 03 8b 45  |f.M.f1...9E....E|
00000230  08 29 45 08 66 01 05 66  83 55 04 00 c7 04 10 00  |.)E.f..f.U......|
00000240  89 44 02 66 89 5c 08 66  89 4c 0c c7 44 06 00 70  |.D.f.\.f.L..D..p|
00000250  50 c7 44 04 00 00 b4 42  cd 13 0f 82 af 00 bb 00  |P.D....B........|
00000260  70 eb 66 66 8b 45 04 66  09 c0 0f 85 97 00 66 8b  |p.ff.E.f......f.|
00000270  05 66 31 d2 66 f7 34 88  54 0a 66 31 d2 66 f7 74  |.f1.f.4.T.f1.f.t|
00000280  04 88 54 0b 89 44 0c 3b  44 08 7d 79 8b 04 2a 44  |..T..D.;D.}y..*D|
00000290  0a 39 45 08 7f 03 8b 45  08 29 45 08 66 01 05 66  |.9E....E.)E.f..f|
000002a0  83 55 04 00 8a 54 0d c0  e2 06 8a 4c 0a fe c1 08  |.U...T.....L....|
000002b0  d1 8a 6c 0c 5a 52 8a 74  0b 50 bb 00 70 8e c3 31  |..l.ZR.t.P..p..1|
000002c0  db b4 02 cd 13 72 46 8c  c3 8e 45 0a 58 c1 e0 05  |.....rF...E.X...|
000002d0  01 45 0a 60 1e c1 e0 03  89 c1 31 ff 31 f6 8e db  |.E.`......1.1...|
000002e0  fc f3 a5 1f be 23 81 e8  57 00 61 83 7d 08 00 0f  |.....#..W.a.}...|
000002f0  85 24 ff 83 ef 0c e9 16  ff be 25 81 e8 42 00 5a  |.$........%..B.Z|
00000300  ea 00 82 00 00 be 28 81  e8 36 00 eb 06 be 2d 81  |......(..6....-.|
00000310  e8 2e 00 be 32 81 e8 28  00 eb fe 6c 6f 61 64 69  |....2..(...loadi|