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Is there a UDF filesystem driver for DOS? (Users)

posted by bretjohn Homepage E-mail, Rio Rancho, NM, 22.05.2013, 17:35

Just got an e-mail from Czerno, contents below. He's done much more experimenting with this stuff than I have.

*********

How are you Bret ? I'm afraid it's a long time since I didn't call...

I've noticed your message to the "DOS ain't dead" forum where you kindly
mentioned me referring to our past discussions of >512k sectors.

I'm not registered at that forum, and declining to ask the admin (Riebisch, if I recall clearly) because I shan't have time to participate actively :(

If you would like to brief the forum - recall what we found back then -

1 - RAMdisk : Ciriaco de Celis's TDSK (available with sources as part of FreeDOS distributions) can create ram disks with 2kbyte sectors out of the box, and 4k sectors modulo trivial patching. Ideal for experimenting.

2 - MSDOS *can* install and use block devices with sectors as large as 32 k (rather than 64k, essentially because buffers including management headers can't exceed one 8086 segment's worth of data)

People should be careful to reduce the number of Config.sys buffers according to the actual max sector size of any block device !

3- though functional (works as designed), MSDOS's undifferentiated management of buffers is a waste when very different sector sizes are present in the system (unavoidable, since no known BIOS can boot from 4k sectors anyway).

With this in mind, if people starts serious work on adding 4k sectors to FREEDOS, IMO they should probably design a system with a separate pools of buffers...

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