Sector header and data records can get out of sync

[davidgiven]

When searching for a data record, it's possible to skip the real data record and instead get the one for the sector following. This is bad.

[bsdphk]

The problem exists in this image:

https://phk.freebsd.dk/misc/crfd0131.tgz

(Please download and keep, I was not allowed to attach the file directly)

Cyl 70, Hd 0, Sector 26 is attributed to Cyl 70, Hd 0, Sector 25