The 'FakeFormat' is a trojan program. Being run it overwrites boot sector and both FAT copies of diskette in drive A: assuming that there's a 1.44 mb diskette is there. After that a diskette boot sector contains a stub that will output:
This is a DATA disk only; Insery system disk, press any key when ready.
The trojan waits for keypress and if CTRL + C combination is pressed exits to system, otherwise it loops (starts ist code from the beginning).
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.
You may also refer to the Knowledge Base on the F-Secure Community site for further assistance.
Technical Details:Alexey Podrezov, F-Secure