Who knows about the disk layout of the Lisa filesystems? from Tom Stepleton on 2014-01-12 (lisalist1)

From: Tom Stepleton <stepleton_at_email.domain.hidden>
Date: Sun, 12 Jan 2014 17:33:54 -0800 (PST)

I now have a lot of disk images... and some spare time coming up in airport waiting areas. Seems like a good time to sit down and start poking at the images with Python.

Does anyone have any information about the disk layout of the Lisa file systems, particularly those on Twiggy diskettes?

I've done some experimenting with Ray Arachelian's lisafsh-tool. For a dc42 image of one of the Office System 3.1 install diskettes, the tool is capable of reading the tag file and emitting the list of files on the disk. It reports the following for the format of the disk:

*MDDF Volume Name: "Office System 1 3.0"*
*Version 0x11: Hierarchial FS with B-Tree catalog Spring Release - 7/7*

However, for Twiggy images, here's what I have instead.

*MDDF Volume Name: "AOS 3:43 pm 5/06/19"*
*Version 0x0e: Flat File System with simple table catalog Release 1.0*

It looks like a different type of file system. The "simple table catalog" suggests that the format of the tag file (or equivalent structure) may differ from what's used by the 3.1 diskettes, which may explain why lisafsh-tool reports no files on the disk.

Thanks,
--Tom

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Received on 2014-01-13 10:26:15