|I would advise you to try an independent computer shop to find a 540MB IDE drive. The BIOS in your 486 can't configure that drive. Even back in the day the drive makers came out with drive overlays in order to use somewhat larger capacity drives. |
I do remember installing a 540MB and letting the BIOS configure it. Came out at something like 508MB.
There should still be plenty of old smaller hard drives sitting on shelves. Any shop that has been in business for some time should have some too.
Another option might be resale shops or flea markets. You may need to buy a complete tower to get the drive.
Click on the link below for ideas. Remember you need a 3.5" IDE/ATA drive, not 2.5". The 2.5" are for laptops and probably require an adapter.