[Info-mtools] mtools version 4.0.16 minfo strange disk type=" S" for some old floppies

[Jörg Jenderek]

Normally minfo produces infomation like disk type="FAT32   " for new big 
haddiscs, disk type="FAT16   " for small harddiscs and disk 
type="FAT12   " for floppy discs. But i found 4 floppy images 
(CRISBOOT.ima, DRD341BD.IMA, Dos3.3.img, dos-211.dcf) with strange values.

For Digital Research DOS ( version 3.41) bootdisc minfo produces the 
following output:

minfo  b:
device information:
===================
filename="/boot/bootsect.bin"
sectors per track: 18
heads: 2
cylinders: 80

mformat command line: mformat -t 80 -h 2 -s 18 -H 603979776 b:

bootsector information
======================
banner:"DIGITAL "
sector size: 512 bytes
cluster size: 1 sectors
reserved (boot) sectors: 1
fats: 2
max available root directory slots: 224
small size: 2880 sectors
media descriptor byte: 0xf0
sectors per fat: 9
sectors per track: 18
heads: 2
hidden sectors: 603979776
big size: 1107305984 sectors
physical drive id: 0x0
reserved=0x0
dos4=0x70
serial number: 20000100
disk label="           "
disk type="       S"


For CRISBOOT.ima i get

device information:
===================
filename="/boot/bootsect.bin"
sectors per track: 18
heads: 2
cylinders: 80

mformat command line: mformat -t 80 -h 2 -s 18 b:

bootsector information
======================
banner:"PHOENIX "
sector size: 512 bytes
cluster size: 1 sectors
reserved (boot) sectors: 1
fats: 2
max available root directory slots: 224
small size: 2880 sectors
media descriptor byte: 0xf0
sectors per fat: 9
sectors per track: 18
heads: 2
hidden sectors: 0
big size: 0 sectors
physical drive id: 0x0
reserved=0x0
dos4=0x0
serial number: 00000000
disk label="           "
disk type="        "

A word like "FATnm   " at offset  54 is displayed as 
disk type by minfo.  Because this word is only a hint for the FAT size , it 
is not a software bug if something like disk type="       S" is printed. 
But  non experts maybe irritated by such information.
So it would be maybe better to call it like "disk type hint string"

By the values of BPP the number of clusters is calculated which determines
the bit size of the FAT like the mtools do. So it would be nice if minfo 
could also display this information which can be used as
fat_bits in the mtools.conf file.

Some sample image files for further examinations are stored under 
http://mitglied.multimania.de/jenderek/mtools/

regards
Jörg
-- 
Jörg Jenderek   email:  joerg.jen.der.ek (at) gmx.net
Germany         PGP:    B9FE A356 283E 0048 6389  18BF AFF2 B1C9 421A D4D6