README

This program "fixes" T10-PI checksums by writing 0xff bytes in the appropriate places. It is licensed with the MIT license. Usage information is included in the massive comment at the top of fix_t10pi.c.

Generally, you'll want to do something like this (assuming a sector size of 4096). If you're working with Type 2, you'll need to add cdbsz=32 for each ddpt instance:
ddpt if=/dev/sde of=- status=progress iflag=pt bs=4096 --protect=3 | ./fix_t10pi /dev/stdin /dev/stdout >(sha256sum - > somefile.sha256sum) | ddpt if=- of=/dev/sdr oflag=pt bs=4096 --protect=0,3

If you are using a different sector size, you'll need to change the #define SECTOR_SIZE_DATA_ONLY to be 512.

Be sure to read the entire comment at the top of the .c file.

Note that you'll see a number of terms and variations that I should probably include here for searchability:
T10PI, T10 PI, DIF, DIX, Data Integrity Field, Data Integrity Extension

For more information about use cases, a purely hypothetical thought exercise was posted at: http://tech.ryancox.net/2020/12/fixing-bad-t10-pi-checksums.html. Any resemblance to real life diasters is purely coincidental.