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#1 cyberlink

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Posted 25 July 2008 - 09:32 AM

I would like to have a bootable usb external hdd of 500GB, with a one FAT32 partition. Is this possible?

Currently I have setup the drive with one primary FAT32 partition of 1GB and one extended partition with logical in it of 499GB. The system can boot MS-DOS from the first drive. This is the dos version which is delivered together with Windows 98 SE.

After booting I can do anything one the boot partition list directory contends, copy files.


When I change to the big partion and perform a listing of the drive with dir. The system gives a directory (corrupt) directory listing and hangs it self.

Does Dos of Windows 98 se support 500GB FAT32 partitions?

I would like to use fat32 in stead of ntfs, to prevent loading ntfs4dos device drivers.

#2 was_jaclaz

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Posted 25 July 2008 - 09:48 AM

There are a number of problems when going over the 48bit LBA barrier. (around 137 GB):
http://www.48bitlba.com/overview.htm

You need to browse/search on msfn.org, there are a number of related threads:
http://www.msfn.org/...98SE-ME-f8.html
http://www.msfn.org/...ojects-f91.html
and some fixes, both for "plain" DOS and for Windows 9x/Me.

However, multipartitioning the drive is advised nonetheless.

I'm moving this to the Windows 9x section.

jaclaz

#3 cyberlink

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Posted 25 July 2008 - 12:46 PM

jaclax,

Thank you for the information. I've done some quick research on the pages that you gave. It seems that it is not possible to have large disk support under MS-DOS.

Anyone,

Question 1:
Do you know why I can access a large NTFS partition from DOS. Is there some kind of a file system driver, which makes large disk supported under DOS?

Question 2:
Does Freedos support large partitions of 500GB or more? I booted from the Freedos live cd, but I was not able to change to the drive with the large partition on it. At that time there was only one partition of 500GB.

Cyberlink

#4 was_jaclaz

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Posted 25 July 2008 - 02:08 PM

Well, I misunderstood your original request, I thought you were talking of Windows 98, but maybe it was too quick a search :cheers:, there is also some reference on MSFN for "pure" DOS.

You NEED anyway to update IO.SYS, FDISK and SCANDISK, do read this thread:
http://www.msfn.org/...-1-t113142.html

And this page:
http://www.mdgx.com/secrets.htm

Try reading about xdma and udma:
http://www.ibiblio.o...files/dos/udma/

And qdma:
http://web.archive.o...t/dos/qdma.html
http://web.archive.o...t/dos/qdma.html
(abandoned AND deleted by the Author, after a quarrel with some of the FreeDos guys):
http://johnson.tmfc....dos/driver.html

Your mileage may vary, of course :cheers:.

Moving this again (to DOS section).

jaclaz




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