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Solved FlexOS migration to a larger HDD

May 27, 2018 at 05:58:25
Specs: COMPAQ PC DOS 3.31, 486/8mb
Hello DOS experts, im having dificulty migrating and running an old software to a bigger HDD, here is my details:

CPU 486
DOS Compaq PC DOS V3.31
SW FlexOS 286 V1.4 ( for Johnson Controls Inc)
HDD 41 MB (type 17) (cyl 977, hds 5,wpcom 300, lzone 977, sect 17)

Im trying to migrate it to a 4GB HDD, im using EZ Drive Disk Overlay and im at to the point that the DOS boots up, but as soon i load the FlexOS the system stalls (hangs),

Any help would be greatly apreciated, Thank you...

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May 27, 2018 at 12:17:25
✔ Best Answer
It's unlikely the machine will support a drive that large directly, so first make sure your disk overlay will also support something that large.

I'd strongly suggest moving to something newer than DOS 3.31, since 32MB is the largest partition that it supports (meaning you'd have to create 125 partitions {more than what's possible} if you'd want to use the entire drive). Move up to DOS 6.22 (which supports 2GB partitions):

It'd be better to move to a solid-state drive (CF drive) to ensure reliability (since even 4GB IDE drives are likely near the end of their life as well):

The above discusses using it to replace a 44-pin drive but similar cards exist for 40-pin.

Once you're sure everything is working, either find an old DOS-based backup program or learn how to use XCOPY to move all files/directories from one drive to another:

"Channeling the spirit of jboy..."

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May 28, 2018 at 00:32:55
Thanks for the reply T-R-A, Ive been working on this for 3 days now and one thing i forgot to do is write down results of HDD and OS combination i tried, but im sure i did tried DOS 6.22 and DDO with 2gb by 2gb partition, i guess il have to start from scratch and get back here to post a table like result of evry HDD & OS combination, Thank You.

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