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Dreamcast lba 150 offset?
Posted: Sun Sep 12, 2021 7:00 am
by MoeFoh
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?
Re: Dreamcast lba 150 offset?
Posted: Mon Sep 13, 2021 5:25 am
by megavolt85
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
Re: Dreamcast lba 150 offset?
Posted: Tue Sep 14, 2021 1:39 pm
by MoeFoh
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'.
Re: Dreamcast lba 150 offset?
Posted: Tue Sep 14, 2021 3:32 pm
by megavolt85
read service documentation
Re: Dreamcast lba 150 offset?
Posted: Tue Sep 14, 2021 4:51 pm
by MoeFoh
DOC file in PDF format: