Well, I'm late to go home, so I'll make this quick.
Maxtor, Seagate, Western Digital and many other companys used to license a software program called Disk Manager. There is a real "Disk Manager" program you can buy, but these licensed versions would typically only work with that manufacturer's brand drives. This would be / is on a floppy disk that ships with the drive. Sometimes they change the name.
The main reason for Disk manager is that many older motherboard have BIOS or other hardware limitations that prevent them from seeing the full size of todays newer drives. When you install Disk Manager, it installs a custom boot-block and translation table on the hard drive that "fools" the motherboard into thinking that it is a smaller drive (usually 8 gig), but once the drive boots the software kicks in and acts as a translator, so the whole drive is visable.
All this is fine except for two things. First, if you boot the system up from a floppy disk (like after a crash) the Disk Manager software is not loaded, so the drive is unreadable. Later version of disk manager started using a special boot menu to resolve this.
Second, if you get hit by a virus that modifies your hard drives boot block, the usual fix is to re-write the boot block. One way to do this is to use FDISK /MBR. Other programs like Norton Utilities have different methods. But if you have Disk Manager's custom boot block, and it gets re-writen, you are 100% screwed. Your drive is unreadable, and it is basically impossible to get it back.
Now, I have to caution, even though I just bought a Maxtor hard drive, I have not looked at the Maxtor software RECENTLY. Their software may no longer be based on Disk Manager and have these problems. But why risk it? The built-in tools of any OS from 98 on are good enough. If your motherboard is too old, I would suggest instead buying an IDE controller card by Promise of Maxtor (same card) that handles this in virus-proof hardware.
Make sense?