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- Newsgroups: comp.sys.apple2
- Path: sparky!uunet!munnari.oz.au!comp.vuw.ac.nz!actrix!David.Empson
- From: David.Empson@bbs.actrix.gen.nz
- Subject: Re: MSDOS FST
- Organization: Actrix Information Exchange
- Date: Fri, 28 Aug 1992 13:02:22 GMT
- Message-ID: <1992Aug28.130222.25748@actrix.gen.nz>
- Keywords: FST PCT MSDOS
- References: <1992Aug27.142308.77220@hal.isc.toronto.ibm.com>
- Sender: David.Empson@actrix.gen.nz (David Empson)
- Lines: 45
-
- In article <1992Aug27.142308.77220@hal.isc.toronto.ibm.com> jeremy@hal.isc.toronto.ibm.com writes:
- >
- > Well, I am finally posting. And I've got a suggestion for this FST. I
- > have a PC Transporter and I realize that devices off of the PCT chain
- > will work (according to reports I've heard) as MSDOS devices with this
- > forthcoming FST. What I would like is for the FST to recognize the MSDOS
- > volumes that are created to simulate hard drives.
-
- The MS-DOS FST will probably only support 5.25" drives connected to
- the PCT, NOT Apple 3.5 Drives.
-
- > Here is the situation for people that don't own a PCT. The software creates
- > a file on a prodos volume, which it fools DOS into thinking is a hard drive.
- > What I would like is for the new FST to recognize this file and treat it
- > like a folder. Then you could click on the file and copy things into and
- > out of your MSDOS hard drive, without going into the PC Transporter
- > software.
-
- Hey, neat idea! Unfortunately, I think this falls into the "too hard"
- basket. The main problem is that the MS-DOS hard drive file is a file
- on a ProDOS volume. You would therefore have to have the MS-DOS and
- ProDOS FSTs interacting with each other. Ugly!
-
- Another problem: you can have a split MS-DOS volume covering two
- files. There isn't any easy way to associate these files with each
- other (no standard naming conventions; they don't even have to be on
- the same drive).
-
- The internal format of the file is straightforward. It is the same as
- the MS-DOS hard drive format, including a drive partition map on the
- first logical track. Each track is 17 sectors (i.e. blocks). Thus:
-
- Block 0: hard drive partition map
- Blocks 1-16: unused (0)
- Block 17: first partition's boot sector
- Block 18: first partition's FAT starts here (I think)
- [the FAT occupies several blocks, according to the volume size]
- Second copy of the FAT
- Root directory
- Allocation clusters
- --
- David Empson
-
- Internet: David.Empson@bbs.actrix.gen.nz EMPSON_D@kosmos.wcc.govt.nz
- Snail mail: P.O. Box 27-103, Wellington, New Zealand
-