1. Computer problem? Tech Support Guy is completely free -- paid for by advertisers and donations. Click here to join today! If you're new to Tech Support Guy, we highly recommend that you visit our Guide for New Members.

Lost Primary Drive Letter After Defrag

Discussion in 'Windows XP' started by dipott, Mar 22, 2008.

Thread Status:
Not open for further replies.
Advertisement
  1. dipott

    dipott Thread Starter

    Joined:
    Mar 22, 2008
    Messages:
    3
    I am running a PC with a Windows 2000 upgrade on top of Windows 98. Have had the system for three years without major incident. The Primary partition C (NTFS 40meg) is used for the OS and programs and D (FAT32 120meg) for data. I also have an external HD for Back Ups and a Dell Inspirion 6400 laptop running XP.

    I recently defragged my PC hard drive. When I rebooted I received the BSOD Stop: 0x0000007B screen and INACCESSIBLE_BOOT_DEVICE message

    I rebooted using a Windows 98 boot diskette and was surprised to find that the Drive C: it saw was my former Drive D:, my former Primary Drive had seemingly disappeared. (Later I learned that DOS cannot see an NTFS partition.)

    fdisk /SYSTEM command provided the following report:

    Disk Drv Mbytes Free Usage
    1 21553 100%
    C: 47084

    (The Drv C: that is reported is actually my original Drive D: which is the second partition on the Disk)

    I then rebooted using a W2K SP4 Boot CD. It identified my Primary Drive C and the Windows 2000 installation and left me with a cursor at C:\WINNT

    A simple CHKDSK reported
    “ CHKDSK found one or more errors on the volume.
    40965716 kilobytes total disk space
    32070704 kilobytes are available

    4096 bytes in each allocation unit
    1024429 total allocation units on disk
    8017676 allocation units available on disk”

    After a CHKDSK /r the report was
    “ CHKDSK found no errors on the volume
    40965716 kilobytes total disk space
    32800476 kilobytes available

    4096 bytes in each allocation unit
    1024429 total allocation units on disk
    8200119 allocation units available on disk”

    Obviously CHKDSK had repaired some files.

    Unfortunately when I rebooted from the hard drive, I again received the same BSOD but with additional parameters, namely:

    Stop: 0x0000007B (0xEB81B84C, 0xC000000E, 0x00000000, 0x00000000) screen and INACCESSIBLE_BOOT_DEVICE message

    I am not in any great panic since my last data backup on the External HD is only about six weeks old and interestingly enough I can access it from my PC. Therefore I can DOS Copy any updated important files to the External HD and carry on life with my laptop and External HD.

    HOWEVER, I would like to get my PC back in operation and would appreciate any suggestions as to my next step to recovery.
     
  2. Elvandil

    Elvandil

    Joined:
    Aug 1, 2003
    Messages:
    51,988
    How can you DOS copy if the drive is NTFS?

    It sounds like either memory or the drive is gone. If you have enough memory sticks, try removing them one at a time. Otherwise, use a bootable test.

    MemScope (Floppy and CD images.)
    Microsoft Memory Test (floppy or CD ISO image)
    Memtest86

    Free Hard Drive Testing Applications:
    HD Tune
    CheckDisk 1.03 (Marks bad sectors as unusable.)
    HDAT2 (Diagnostics and bad sector recovery)
    MHDD Low-level Diagnostics
    Bootable Hitachi Drive Fitness Test Floppy or CD Image (works on most drives)

    Hard Drive Manufacturers' Diagnostic Utilities Links:
    TachTech
    BleepingComputer
     
  3. dipott

    dipott Thread Starter

    Joined:
    Mar 22, 2008
    Messages:
    3
    Thanks for quick input;

    The original C: is a NTFS partition on the drive. D: is the FAT32 partition completing the drive. It is D: with data files that I can DOS copy to my external HD which shows up when I connect via USB.

    Will try the memory and HDD testing but believe the problem is some missing OS files. I am beginning to think that an external program like my Avast virus detection software might have updated its database while Defrag was operating. This might have interrupted Defrag or caused it to overright some OS files.

    dipott
     
  4. managed

    managed Trusted Advisor Spam Fighter

    Joined:
    May 24, 2003
    Messages:
    10,329
    First Name:
    Allan
    What does the Bios show for the hard drive ?
     
  5. Elvandil

    Elvandil

    Joined:
    Aug 1, 2003
    Messages:
    51,988
    What do diskpart or map show for partitions when you log into Recovery?

    Can you dir the C: drive?

    Drive letters assigned by DOS or anything other than the OS may differ and can be ignored as far as what the OS is seeing.
     
  6. dipott

    dipott Thread Starter

    Joined:
    Mar 22, 2008
    Messages:
    3
    I feel privileged to have two Techguy specialists addressing my Lost Drive problem. You are each approaching the problem from a different direction and I am going to assume that with the workload you guys accept, you probably only see replies to your specific queries. Therefore I am going to combine my responses since we are looking for clues wherever we can find them.

    I will first answer your individual questions and then relate a new event.

    Elvandil – “What do diskpart or map show for partitions when you log into Recovery? Can you dir the C: drive?”

    Yes I can dir the C: drive. Both diskpart and map see all drives, specifically map reports:

    ? 0 MB \Device\Harddisk0\Partition0
    C: NTFS 40006 MB \Device\Harddisk0\Partition1
    ? 112620 MB \Device Harddisk0\Partition0
    D: FAT32 112620 MB \Device\Harddisk0\Partition2
    A: \Device\Floppy0
    E: \Device\CD ROM0
    F: \Device\CD ROM1

    Managed – “What does the Bios show for the hard drive ?”

    Assume you are looking for Boot Drive Priority;

    1st Boot Device [1st Floppy Drive]
    2nd Boot Device [ 3M-BENQ CDRW 5232X]
    3rd Boot Device [PM-WDC WD1600JD-00HBB0]

    I am interested/concerned that the right hand panel states “A device enclosed in a parenthesis has been disabled in the corresponding type menu”. Nevertheless, I know that my PC is booting from the floppy first and then the CD notwithstanding the previous quotation??

    Hard Disk Drives
    1st Drive [PM-WDC1600JD-00HBB0]

    New Event – A FUNNY THING HAPPENED ON THE WAY TO THE BIOS

    In accessing the BIOS to answer the question from ‘Managed’, I inadvertently pressed F8 instead of F2. This obviously gave me the “Windows 2000 Advanced Options Menu where I had been earlier when I attempted (unsuccessfully) to boot in Safe Mode (same BSOD). Only this time I saw the menu item “Last Known Good Configuration”.

    My selection of this menu item presented me with a past “Profile1” which in turn gave me full Windows access. The first thing I did was run a virus scan (Avast) which gave a clean report (admittedly the virus database is a couple of months old since I have been fooling around with this problem that long). I then exited Windows 2000 and restarted in an attempt to boot from the HD – no luck – same BSOD.

    So now I can access my Windows 2000 OS with my “Last Known Good Configuration” so now what can I do to determine the source of my problem with a normal ‘boot’??
     
  7. Elvandil

    Elvandil

    Joined:
    Aug 1, 2003
    Messages:
    51,988
    You could try booting from one of these. It looks like you should choose hard disk 1 and partition1, but the menu allows to to try to boot to other partitions. If you can boot successfully, then the boot files can be copied from the boot media or edited in 2k once booted up (boot.ini).

    These are for XP but work for any NT system.

    Bootable XP Sysboot Floppy
    XP Sysboot CD Image
     
  8. Sponsor

As Seen On
As Seen On...

Welcome to Tech Support Guy!

Are you looking for the solution to your computer problem? Join our site today to ask your question. This site is completely free -- paid for by advertisers and donations.

If you're not already familiar with forums, watch our Welcome Guide to get started.

Join over 733,556 other people just like you!

Loading...
Similar Threads - Lost Primary Drive
  1. jimny
    Replies:
    2
    Views:
    225
Thread Status:
Not open for further replies.

Short URL to this thread: https://techguy.org/695977

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice