98se

I assume that you mean how much free hard drive space do you need to install W98.

Per Microsoft:

"120 MB of free hard disk space (typical installation requires approximately 195 MB of free hard disk space, but the required space may vary from 120 MB to 295 MB, depending on your computer's configuration and the options that you choose to install)"

Personally, I would want a minimum of a 1GB hard drive to allow for drivers and application software.

My W98SE system has a 16GB primary partition that has mainly system files on it.
Not including some data files, I am using around 3GB for Windows 98 and system utilities such as my anti-virus and firewall software.

Chas

This question was closed by the author