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I have a dynamic disk overlay installed and usually can see my entire disk but sometimes when I boot I can't access my hard disk, or I can only see 504 MB (or 528 decimal MB) of it
Explanation: A dynamic disk overlay has been installed to permit access to a large hard disk volume on a PC without BIOS support for large disks. The disk normally works fine, but under certain circumstances the disk cannot be accessed, or appears to the system as being only 504 MB in size (528 decimal megabytes).
Diagnosis: A dynamic disk overlay is a driver that is loaded very early in the boot process. This piece of software acts as the translation facility for a BIOS that doesn't have one built-in, allowing access to a large hard disk on a system that would otherwise be limited to 504 MB per disk. If anything happens to cause the overlay not to be loaded during the boot process, problems will result. Common culprits are booting from a floppy disk that wasn't made using the dynamic drive overlay software and also viruses.
Note: If you need to boot
the system clean to get rid of a virus, booting the hard disk first in this manner will be
self-defeating, but booting a regular floppy disk straight will not allow proper access to
the hard disk. This is why you need a boot floppy that includes your drive overlay.