Partitioning

[Unspoken_Magi]

This may be nuts... I partitioned my floppy...

Code: Select all

partition_table:
            ; CHS 80/2/18
   db   0x80      ; Flag
   db   0x00      ; Starting Head
   db   0x02      ; Starting Sector
   db   0x00      ; Starting Cylinder
   db   0x07      ; Type
   db   0x01      ; Ending Head
   db   0x01      ; Ending Sector
   db   0x79      ; Ending Cylinder
   dd   0x00000001   ; Starting Sector
   dd   0x00000b2e   ; Length

1. Are these values correct?
2. Which numbers should be trusted, the LBA or the C/H/S (H/S/C)?

Also, which numbers should the MBR code trust to be correct, the LBA or the CHS?
Should the MBR code use INT13 AH=0x42 (LBA read), or AH=0x2 (CHS read)?

[Pype.Clicker]

err ... afaik, you cannot partition a floppy ...

[Unspoken_Magi]

err ... afaik, you cannot partition a floppy ...

Well... why not? It works fine...

Just treat it like a 1.44 Mb hard-drive.
In Bochs, I can test it as a 1.44 Mb HD or a floppy.

[Peter_Vigren]

The Master Boot Sector uses CHS.

[Slasher]

but also contains fields for LBA numbers.

[Peter_Vigren]

but also contains fields for LBA numbers.

Where does it do that?

[Slasher]

near the end, i think its the start/no of sector
do not have doc here right now

[K.J.]

This should help you:
http://ata-atapi.com/hiwtab.htm

K.J.

[richie]

Hello!
As far as I know also Minix partitions floppy disks. Perhaps this helps you.