You can not disable a partition in Windows 98 but you can remove it(everything on the partition will be lost if not saved beforehand on a cdr-rw or another hard drive). Boot up with a windows 98 floppy with th Operating System on it and the the Fdisk.exe file on it. At the "A" prompt, type "fdisk" and press enter. When the fdisk screen pops up, first be sure which partition you want to delete (D,E etc)so you don't delete the partition with your operating system on it (the "C" drive). Once you have determined which partition is to be deleted, follow the onscreen instructions to remove the correct one. When finished, close out the program and reboot the system and the partition should be gone.
FDISK
Of course you need to partition your drive. If you already have installed Windows XP You need to make a new partition for win98 formated FAT32. WinXP use NTFS formatting.
Create two partitions in ur hard drive and install Windows '98 on Drive C and install Windows 2000 on Drive D to another partition.
On a Windows 98 system, there is very likely to only be one partition on the disk. The difference between formatting the disk and deleting the partition would thus be a matter of semantics. Either way, all the data on the hard drive would be gone.
It is very easy to do this. The only thing you must remember is that you cannot install windows 98 from Windows XP environment. Either install 98 first and then XP or after installing XP reboot in DOS mode. The install will ask for the drive to install to when you do so?
Fdisk. Windows 98 cd's are not bootable (for the most part) so in order to partition a new hard disk in preparation of a windows 98 install, you will need to make a boot floppy (or boot CD, or USB) which will enable you to partition and format the disk for windows install. Follow the link below for some disk images, utilities, and workarounds for the windows 98 bootdisk dilemma.
Because Windows 98 doesn't support reading or writing NTFS partitions.
Windows 98 can be installed on a FAT16 or FAT32 partition (FAT32 is the best choice for disks larger than 512 MB, and supports long file names better).
This usually occurs after formatting or putting a new hard drive into a system and needs to be fidisked. To do this get to a dos prompt usuing a bootable floppy, type in fdisk and partition the hard drive using the on screen options (create new partition)(fat32 for windows 95/98/me ntfs for nt/xp/2000)
There is always 8 MB of unpartitioned space so that you can retain the ability to convert the drive to a dynamic volume. If you have already partitioned the drive from the following operating systems, the empty drive is hidden: MS-DOS Microsoft Windows 95 Microsoft Windows 98 Microsoft Windows 98 Second Edition Microsoft Windows NT 4.0 Microsoft Windows 2000
The only real limit that would apply is the FAT32 partition size limit, which is about 2 TB. No Flash drive comes close to this size.
Windows 98 cannot interact with the Windows NT file system. To install Windows 98, you will need to use a partition tool to divide the hard drive, and then install a special boot manager to load them both.