У тебя наверное шесть логических дисков, поэтому и запускает шесть раз. Вылечить это конечно можно. И не только до одного, но и вообще отключить:
Chkntfs is a utility that enables a system administrator to exclude volumes from being checked by the autochk program. The utility is run from a command prompt and has the following command line options:
chkntfs drive: [...]
chkntfs /d
chkntfs /x drive: [...]
chkntfs /c drive: [...]
drive: Specifies a drive letter.
/D Restores the machine to the default
behavior; all drives are checked at boot
time and chkdsk is run on those that are
dirty. This undoes the effect of the /X
option.
/X Excludes a drive from the default boot-
time check. Excluded drives are not
accumulated between command invocations.
/C Schedules chkdsk to be run at the next
reboot if the dirty bit has been set.
If no switches are specified, chkntfs displays the status of the dirty bit for each drive.
Examples:
chkntfs /x c: This disables chkdsk from running on drive C:
chkntfs /x d: e: This disables chkdsk from running on drives D: and E:.