Selecting Drives->Check will launch the Presentation Manager check disk (CHKDSK.EXE) program, an OS/2 utility distributed with the operating system which checks the selected drive for file system errors. If the "Write Corrections to Disk" option is checked, the program must have access to all files on the drive and there can be no running processes accessing the drive.
The PMCHKDSK.EXE executable program must be located in a directory included in the PATH statement of the CONFIG.SYS file.