"While using FDISK, each time you create a partition or logical drive, FDISK displays the following message on the bottom of the screen:
Verifying drive integrity, --% complete.
The percentage counts 0 to 100. When verifying the drive?s integrity, FDISK is checking the tracks where the system files and FAT will be stored. FDISK displays this message since it has capabilities for setting up very large drives and the process may take some time.
The check initially verifies the numberof tracks necessary to hold the system files and FAT as if the entire disk were partitioned as one primary partition. If you create an extended partition it will verify the number of tracks necessary to hold the system files and FAT as if the remaining portion were partitioned as one logical drive. Finally, with each logical drive created, FDISK verifies the number of tracks necessary to hold the system files and FAT as if the remaining portion of the extended partition were defined as a logical drive. This repeats until you finish creating logical drives."
That came from this page: http://www.ontrack.com/hardwareinfo/fdisk.asp
And if you want the Microsoft writeup, go to Technet article 255867:
http://support.microsoft.com/default.aspx?scid=kb;en-us;255867
(please remove any spaces)
hope this helps