Computer Operating Systems
Urban Voice -- Instructor: Lenny Bailes
Day 16 Agenda
1. OTX orientation
2. Continue review of DOS commands and Chapter 3 concepts.
(See http://www.software-recovery.com/fat_recovery.htm for a good explanation
and picture of the file structure on FAT-based hard drives.)
ATTRIB command can be used to reset archive (backup status), read-only and system attributes of a file.
(See DOS Exercise sheet, 17-19)
SYS command can be used to make a floppy or hard disk partition bootable under MS-DOS command-line
included with Windows 9.x.
SCANDISK used to check/repair disk file system (floppy or hard drive) under Windows 9.x
CHKDSK used to check/repair disk file system (floppy or hard drive) under MS-DOS 6 and Windows
SCANREG used to check/repair system registry under Windows 9.x
DEFRAG used to defragment floppy or hard disk partition under Windows 9.x/2000/XP
VER displays OS version|
EXTRACT extracts single files or a group of files from a Windows cabinet (CAB) file.
DEBUG used to display system-level information in RAM or on disk.
3. Continue working on DOS Exercise sheet in the A+ Lab
Exercises 14-16: Where did the missing 256K of conventional memory go after you loaded the device
drivers in the CONFIG.SYS you created? ___________________________
When we use the ATTRIB command to unhide the MSDOS.SYS and IO.SYS files, they can be deleted
from a bootable disk (either a hard drive or floppy). When we delete the IO.SYS file, a boot drive is no longer
bootable. In these exercises, you discover that, and then restore the file to your boot drive.
Exercise 20: We change the parameters that load the RAMDRIVE.SYS driver in CONFIG.SYS, with
a corresponding shift in conventional/extended memory resources.
Work on or complete the DOS Exercise Sheet
Study for Chapter 3 Quiz!
Review A+ in Depth, Chapter 4, p. 125-152. Write out answers to questions 1-6 on p. 172-173