I used to have an old Toshiba T2000SX laptop, but some day its HDD died. I found a newer laptop HDD that fit in and I could format it to appear to have a small enough capacity to get detected by the laptop.
However, I could not boot from this disk, although reading and writing to it worked like a charm. Installing DOS and even Win 3.11 went well, I just had to always boot from a boot floppy disk that then loaded the system on the HDD.
When I tried to boot directly from the HDD, the screen filled with rows of
02 sequences that then started to continuously move to the left (if I remember correctly) as soon as the screen was full. No reactions any more, need to hard-reset.
So I guessed Toshiba has built some kind of protection into the chipset that prevents booting from non-Toshiba HDDs. I continued occasionally using it by booting from a floppy, but when the floppy drive later died as well, I abandoned the entire laptop.
Out of pure curiosity, was this "error
02" really a protection against foreign HDDs or would it have had a different cause? Were such protection mechanisms common back in this laptop's time?