Microsoft KB Archive/80570

= Switching from DR-DOS 6.0 to MS-DOS 5.0 =

Article ID: 80570

Article Last Modified on 11/16/2006

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APPLIES TO


 * Microsoft MS-DOS 5.0 Standard Edition
 * Microsoft MS-DOS 5.0a

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This article was previously published under Q80570



SUMMARY
Switching from DR-DOS 6.0 to MS-DOS 5.0 is accomplished much like you would switch from MS-DOS 4.x or 5.0 to another version of DOS. However, when switching from DR-DOS 6.0 to MS-DOS, some additional steps may be necessary IF:


 * The DR-DOS security system was used to safeguard the entire system. -or-


 * The DELWATCH utility was used.



System Security
When you use the DR-DOS Setup utility to install the DR-DOS security system, DR-DOS Setup does the following:


 * Adds a driver to the CONFIG.SYS file that asks for your password at bootup. If you do not enter the correct password, the system does not boot.
 * Changes the partition type of the DR-DOS partition(s). This is to prevent a user from booting MS-DOS on a floppy disk and accessing the drive.

However, the password can be disabled by editing the CONFIG.SYS file, however, the hard drive partition(s) will be inaccessible to MS-DOS unless you have removed the security option using DR-DOS Setup. If you have ever used this security option, do the following:


 * Use the DR-DOS Setup utility to remove the system security.
 * If you have disabled the utility by directly modifying the CONFIG.SYS file, use the DR-DOS Setup utility to re-enable and then disable system security.

DELWATCH
The DR-DOS 6.0 DELWATCH utility changes how DR-DOS implements deletions. Under MS-DOS (and non-DELWATCH DR-DOS) behavior, a file is deleted by marking the first character of a file with the &quot;E5&quot; character, and then marking the area of the disk that the file was stored &quot;unused&quot; in the file allocation table (FAT). DELWATCH marks the file as &quot;pending delete&quot; by changing the first character of the file to the &quot;05&quot; character. These files are not really deleted until the utility DELPURGE is used.

&quot;Pending delete&quot; files can cause confusion to MS-DOS and its utilities (such as CHKDSK and UNDELETE) as well as third-party disk utility programs. Before using MS-DOS, do the following:


 * Determine if you have &quot;pending delete&quot; files using the DR-DOS 6.0 CHKDSK utility.
 * If you load DELWATCH in the AUTOEXEC.BAT or CONFIG.SYS file, remove the DELWATCH command and reboot to disable DELWATCH.
 * Run DELPURGE immediately before booting MS-DOS or installing the MS-DOS 5 Upgrade.

The product included here, DR-DOS, is manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding this product's performance or reliability.

Additional query words: 3.20 3.30 3.30a 4.00 5.00 5.00a 5.0 5.0a 3rdparty

Keywords: KB80570

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