Hi Eero Le 27/10/2020 à 14:54, Eero Tamminen a écrit : > Hi, > > On 10/27/20 12:19 PM, Emmanuel Kasper wrote: >> Partitions smaller than 32M, are indeed formatted as FAT16 by GEMDOS. > > Formatted by GEMDOS? > > Hard disk support in Atari TOS requires separate > hard disk drivers. Those have utilities for > hard disk formatting, TOS supports only formatting > of floppies. > > >> disktype /dev/mmcblk0p4 >> Partition 4: 12.04 MiB (12619776 bytes, 24648 sectors from 139490) >> Type "GEM" (Standard GEMDOS) >> FAT16 file system (hints score 3 of 5) >> Volume size 11.98 MiB (12558336 bytes, 12264 clusters of 1 KiB) >> >> This is not a problem whatsoever for Linux: those small FAT16 partitions >> are handled correctly by fsck and mount, without forcing a fat type or >> option, and are working correcting in TOS too. > > There are many historical hard disk drivers and > formatting utilities for Atari. I think the only > still maintained (commercial) one is HD Driver > (hddrutil.app): > https://www.hddriver.net/en/ > > But in theory users might still have hard disks > formatted by the older hard disk programs like > Cécile (cc_tools.app), ICDPro (icdfmt.prg), CBHD > (cbhdconf.app) or Atari's AHDI (hdx.prg). > > (Older versions of them may also have formatted > hard disk slightly differently.) > > Which of the Atari hard disk formatting utilities > you tried?
Ha, I did not know that the FAT16 support was coming from the hard disk driver ! I used AHDI 5.0 in my test. According to the Table in 4.9.1, in http://info-coach.fr/atari/documents/_mydoc/Atari_HD_File_Sytem_Reference_Guide_v1.1b.pdf all other hard disk drivers can also access FAT16 partitions < 32 MB. I don't know if the other drivers would *create* FAT12 partitions in any case, but since the above guide never talks about FAT12, I would be suprised if they did. > Do we still care about hard disks that have been formatted with native > Atari SW, when user can > mount them in a PC emulator like Hatari, copy > files to safety and re-format the disk? Personally I don't mind that much about which tool formatted the hard disk, I was only pondering if we need code in the kernel to treat smaller partitions as FAT12, when these partitions are created as FAT16 on the Atari side. Emmanuel -- You know an upstream is nice when they even accept m68k patches. - John Paul Adrian Glaubitz, Debian OpenJDK maintainer
