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- Newsgroups: comp.os.msdos.misc
- Path: sparky!uunet!psinntp!panix!schuster
- From: schuster@panix.com (Michael Schuster)
- Subject: Fatal DOS 5.0 Upgrade CHKDSK bug
- Message-ID: <1992Dec23.023802.18447@panix.com>
- Date: Wed, 23 Dec 1992 02:38:02 GMT
- Organization: PANIX Public Access Unix & Internet, NYC
- Lines: 117
-
- Once again, Microsoft amazes me.
- After months and months of people complaining that their disks
- get corrupted when running CHKDSK on a full partition, Microsoft
- "quietly" distributes this:
-
-
- ======================================================================
- Microsoft Product Support Services Application Note (Text File)
- PD0646: UPDATED CHKDSK.EXE AND UNDELETE.EXE FILES
- ======================================================================
- Revision Date: 12/92
- Disk Included
-
- The following information applies to Microsoft MS-DOS 5 Upgrade 5.0.
-
- --------------------------------------------------------------------
- | INFORMATION PROVIDED IN THIS DOCUMENT AND ANY SOFTWARE THAT MAY |
- | ACCOMPANY THIS DOCUMENT (collectively referred to as an |
- | Application Note) IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY |
- | KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO |
- | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A |
- | PARTICULAR PURPOSE. The user assumes the entire risk as to the |
- | accuracy and the use of this Application Note. This Application |
- | Note may be copied and distributed subject to the following |
- | conditions: 1) All text must be copied without modification and |
- | all pages must be included; 2) If software is included, all files |
- | on the disk(s) must be copied without modification [the MS-DOS(R) |
- | utility DISKCOPY is appropriate for this purpose]; 3) All |
- | components of this Application Note must be distributed together; |
- | and 4) This Application Note may not be distributed for profit. |
- | |
- | Copyright 1992 Microsoft Corporation. All Rights Reserved. |
- | Microsoft and MS-DOS are registered trademarks and Windows |
- | is a trademark of Microsoft Corporation. |
- --------------------------------------------------------------------
-
- INTRODUCTION
- ------------
-
- The Microsoft MS-DOS CHKDSK and UNDELETE commands dated 04/09/91,
- which are included in the Microsoft MS-DOS 5 Upgrade, do not work
- correctly on logical drives that require 256 sectors to store each
- copy of the file allocation table (FAT). If any of the partitions on
- your hard disk drive are within the ranges listed in the following
- section and you do not have version 5.0a of the Microsoft MS-DOS 5
- Upgrade, which includes CHKDSK.EXE and UNDELETE.EXE files dated
- 11/11/91, install the updated CHKDSK.EXE and UNDELETE.EXE files
- included with this application note.
-
- If your FAT occupies 256 sectors, using the CHKDSK.EXE file dated
- 04/09/91 with the /f parameter ("chkdsk /f" [without the quotation
- marks]) can result in data loss. Using the UNDELETE.EXE file dated
- 04/09/91 can lead to unpredictable results.
-
- DETERMINING IF YOU NEED TO INSTALL THE UPDATED FILES
- ----------------------------------------------------
-
- Drives require a 256-sector FAT if they have partitions within the
- size ranges listed below. Because the potential problems are serious,
- these ranges include a margin of safety.
-
- 127 MB-129 MB
- 254 MB-258 MB
- 508 MB-516 MB
- 1018 MB-1030 MB
- 2035 MB-2061 MB
-
- You can use the Fdisk program to determine if you have a 256-sector
- FAT with the following procedure:
-
- 1. At the MS-DOS command prompt, type the following and press the
- ENTER key:
-
- fdisk
-
- 2. Press 4 on the keyboard to select the Display Partition Information
- option and press ENTER.
-
- 3. The primary partition size is listed under the Mbytes heading. If
- the size falls within any of the ranges specified above, install
- the updated CHKDSK.EXE and UNDELETE.EXE files on the enclosed
- PD0646 disk.
-
- 4. If you have an extended partition, press the ENTER key to view
- those partition sizes. If any of the extended partition sizes
- listed under the Mbytes heading fall within the ranges specified
- above, install the CHKDSK.EXE and UNDELETE.EXE files on the
- enclosed PD0646 disk.
-
- 5. Press the ESC key twice to exit to the MS-DOS command prompt.
-
- TO REPLACE YOUR CHKDSK.EXE AND UNDELETE.EXE FILES
- -------------------------------------------------
-
- 1. Insert the enclosed PD0646 disk in your floppy disk drive.
-
- 2. At the MS-DOS command prompt, type the following lines, pressing
- ENTER after each line
-
- copy drive:\chkdsk.exe destination
- copy drive:\undelete.exe destination
-
- where "drive" is the floppy disk drive containing the PD0646 disk
- and "destination" is the drive and directory where your CHKDSK.EXE
- and UNDELETE.EXE files currently reside. For example, if CHKDSK.EXE
- and UNDELETE.EXE are located in the DOS directory on drive C and
- the PD0646 disk is in drive A, you would type the following
- commands:
-
- copy a:\chkdsk.exe c:\dos
- copy a:\undelete.exe c:\dos
-
-
- --
- _______________________________Mike Schuster________________________________
- NY Pub. Access UNIX/Internet: schuster@panix.com | 70346.1745@CompuServe.COM
- The Portal (R) System: schuster@shell.portal.com | MCI Mail,GEnie: MSCHUSTER
-