You can upgrade to practically the maximum available amount of harddrive space as long as the new drive is IDE. The following picture shows the drive you require:
A guide to replace a hard disk for this PC is available
here.
As a rule of thumb, you should buy the maximum size hard disk you can afford as it improves the performance.
You can choose from any brand but choose the one with maximum warranty.
PS. There is no need to go into any kind of numbers; just ask the vendor to give you a certain size IDE hard drive eg a 250GB Western Digital IDE hard drive.
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