Yes, I remember 2.1 GB SCSI drives being sold for Unix workstation with a (boot-) disk size limit of 2 GB.
Probably some older HP 9000/700 or Sun Sparcstation, or it was just an OS limit.
The vendor asked about 10 bucks for this extra service, above to the price of the disk,
but I need to check if they only offered Seagate disks with this option.

Allthough I am an experienced SCSI user owning dozens of drives I did not perform the procedure myself.
It was something like changing the drive parameters from some storage system disks with strange sector sizes back to the 512 kBit standard.

Bart's SCSITOOL might do the job, but I cant find a download.

I found Bart's SCSI Tool Utility but it has no section for capacity.