Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.


Partition Size

Partition Size

Hello everyone

It's been awhile since I built a DOS 6.2 with Windows 3.1 machine but, I have a windows 2000 machine with virtual PC loaded on it and I want to build a DOS virtual PC. Would someone tell me what the max size of the partition I can make to load DOS 6.2 and install Windows 3.1. I am thinking it is around 500 meg but, I can't remember for sure. Any help will be gratly appreciated.

Thanks Randy

RE: Partition Size

Was 2.1 GB for fat16.  But the bigger you made it, the more waste.
If I recall correctly, the cluster size break from 4K to 16K was around 540mb.
You might try a google search on "cluster size". Used to pop up in the first or second page.

Ed Fair
Give the wrong symptoms, get the wrong solutions.

RE: Partition Size

The maximum sized partition under DOS 6.2 is 512MB, unless, of course, you use a DDO (dynamic disk overlay) program, which is designed to fool DOS and BIOS (in older machines) into allowing a larger disk. Such a program can be downloaded from the site of many hard drive manufacturers.


"It's what you learn after you know it all that counts"  --My Dad

RE: Partition Size

Looking in the Help file for MS-DOS 6.20 and 6.22 shows the maximum partition size for both as 2GB, probably would be for 6.21 also.

RE: Partition Size

Hello Everyone

THanks for the information it helped out alot.


RE: Partition Size

All I know is that I remember having a machine wih Windows 3.11 on top of DOS 6.22, and I had to use a DDO to get it to recognize a 1GB HDD. But . . . I dunno . . . perhaps it was the BIOS of that machine. If you say you saw it in DOS itself, Blujacket, I believe you. It's good to know.


"It's what you learn after you know it all that counts"  --My Dad

RE: Partition Size

the 2.1 is a DOS limitation, the 512 was a BIOS limitation.
32K maximum cluster size by 65K clusters.

Ed Fair
Give the wrong symptoms, get the wrong solutions.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members!


Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close