anthal - 2024-08-03

Hello!

I have questions about Atari TOS partitions.

1. Why map "Atari TOS basic data" from GUID 734E5AFE-F61A-11E6-BC64-92361F002671 to MBR A2?

gptfdisk is the only source I could find that has MBR partition type A2 mapped to Atari TOS (indirectly: in parttypes.cc, line 359), so A2 would be the MBR type for Atari TOS partitions. Other sources for MBR types (that don't list Atari) are e.g. https://www.win.tue.nl/~aeb/partitions/partition_types-1.html and https://thestarman.pcministry.com/asm/mbr/PartTypes.htm. Also, I cannot find any partition type e.g. in https://raw.githubusercontent.com/wiki/mist-devel/mist-board/Atari_HD_File_Sytem_Reference_Guide.pdf.

2. Does gptfdisk currently check if an Atari GPT partition is covered within 32 bit wide LBA sector numbers?

According to https://www.hddriver.net/en/exchange.html TOS does not support 64 bit wide sector numbers.

3. It seems as if there is currently an addition in preparation: "Atari TOS raw data". Would you add it to gptfdisk?

See https://www.hddriver.net/forum/viewtopic.php?p=1233#p1233 for details. The new GUID is 35540011-B055-499F-842D-C69AECA357B7. What it is good for I don't know. I don't understand it really, because I also don't get what uweseimet means with "raw MBR partition". What would that be?

Thanks for reading!

 

Last edit: anthal 2024-08-03