More than likely, you don't need the disk manager program. Having it on there doesn't hurt anything but it will slow down your boot times.
<< - Drive overlays - programs designed to overcome BIOS limitations. These program have different names, for example: EZ-Drive (Western Digital), Disk Manager (Seagate), MaxBlast (Maxtor). They are usually supplied with retail-packaged HDDs, and are also available from HDD manufacturers' websites.
When a drive overlay program runs during the boot sequence, it installs a small program that replaces some of the BIOS's drive access services with its own routines. Therefore, in order to access the drive, you must boot from the drive where the drive overlay was installed. If you boot from another drive (diskette, CDROM, another HD), chances are you won't see the "overlayed" drive's partitions.
To uninstall a drive overlay program, you should use it's uninstall feature. The more "low-level" way of doing this - and losing all the files on the drive - is booting from another drive, and typing "FDISK /MBR". At this point, the drive overlay will be overwritten, and looking in FDISK, you'll see "non-DOS" partitions instead of your formerly overlay-driven partitions. You can simply delete them, and create new, overlay-free partitions. >>