The "Autocheck" parameter determines for which volumes JFS will automatically perform a CHKDSK at system startup.

Simply enter the respective drive letters here (without the trailing ":").

Note however that the meaning of this parameter is slightly different compared to the corresponding parameter of HPFS.IFS:

Example: If you enter C+DE, drive D: will receive a full check, while C: and E: will only have their journal logs replayed.