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I booted from my floppy disk and now I can't see one or more hard disk volumes that work when I boot from the hard disk itself
Explanation: After booting from a floppy disk, one or more of the hard disk volumes that are normally present on the system seems to disappear.
Diagnosis: This is usually caused by drivers that are on the hard disk being bypassed when the floppy disk is booted. Another culprit is the ever-present virus threat. Some particularly nasty viruses encrypt the hard disk structures; when the hard disk is booted they load and then "decrypt" the structures on the fly. When you boot from the floppy the virus is bypassed and the encrypted structures cannot be read by the system. (Obnoxious, isn't it?)