Dreamcast lba 150 offset?

Post by **MoeFoh** » Sun Sep 12, 2021 7:00 am

I been doing some reading, and still don't have a good understanding of the 150 lba offset used with gdi image dumps. Why does it exist in the first place? What is the LBA of track 3?

Post by **megavolt85** » Mon Sep 13, 2021 5:25 am

MoeFoh wrote: Oddly enough, dumpers were told to subtract 150 from the reported lba when the .gdi text was created, even though the reported lba was correct (45150).

you are confusing LBA and LSN
Logical Block Address = 45000
Logical Sector Number = 45150

Post by **MoeFoh** » Tue Sep 14, 2021 1:39 pm

megavolt85 wrote:
MoeFoh wrote: Oddly enough, dumpers were told to subtract 150 from the reported lba when the .gdi text was created, even though the reported lba was correct (45150).
you are confusing LBA and LSN
Logical Block Address = 45000
Logical Sector Number = 45150

That makes sense. You're the first one to mention 'Logical Sector Number'.

Post by **megavolt85** » Tue Sep 14, 2021 3:32 pm

read service documentation

Gdfm_s132e.doc: (470 KiB) Downloaded 177 times

Post by **MoeFoh** » Tue Sep 14, 2021 4:51 pm

DOC file in PDF format:

Dreamcast-Talk.com

Dreamcast lba 150 offset?

Dreamcast lba 150 offset?

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