So I'm trying to split a 64MB file FileCarve.001 into 512 byte segments (each block is 512 bytes long). I need to make sure the file has the same data when split into smaller files, so I cat all the files to standard out and pipe it into sha256sum (there's a lot of files, so I need to do this with find and xargs).
Splitting the file in 512 byte segments seems to garble the data when the output gets split by the split command.
$ dd if=FileCarve.001 bs=512 | split -b512 - splits/img
131072+0 records in
131072+0 records out
67108864 bytes (67 MB, 64 MiB) copied, 4.10824 s, 16.3 MB/s
$ sha256sum FileCarve.001
3e64100044099b10060f5ca3194d4d60414941c7cb26437330aba532852a60cd FileCarve.001
$ find splits/ -type f -print0 | xargs -0 cat | sha256sum
25b37f28204895e5d0b1cb160c5fa599d15188baf7e529ccc92a10fdb3f0515a -
But splitting the file in 1 kilobyte segments (1000 bytes) seems to work just fine.
$ dd if=FileCarve.001 bs=512 | split -b1k - splits/img
131072+0 records in
131072+0 records out
67108864 bytes (67 MB, 64 MiB) copied, 2.06029 s, 32.6 MB/s
$ sha256sum FileCarve.001
3e64100044099b10060f5ca3194d4d60414941c7cb26437330aba532852a60cd FileCarve.001
$ find splits/ -type f -print0 | xargs -0 cat | sha256sum
3e64100044099b10060f5ca3194d4d60414941c7cb26437330aba532852a60cd -
Why are they different? Is there something I don't understand about the way blocks work on a storage device?
In response to a comment: I did clear out the split/ directory on each run.
