1.    30 Aug 2016 #1
    Join Date : Aug 2015
    Posts : 56
    Win 10 Pro X64, Win 10 Home X64, Win 7

    Can't access secondary drive and power failure during CHKDSK

    I had a file folder on my secondary drive D: which I wanted to delete. Windows wouldn't delete it and gave me an error code 0x80070091. A Google search suggested running CHKDSK and I did that (chkdsk /f /r D. However, there was a power failure when CHKDSK was at 10%.
    Now Windows will load correctly (drive C but my secondary drive D: is inaccessible. In Computer Management/Disk Management, the drive is shown as RAW.
    When I load File Explorer, it loads VERY slowly probably because it is looking for Drive D:.
    I have a fairly recent backup of my D: drive and should be able to reformat and reload. However, I'd prefer to fix the problem if possible.
    When I right click the D: drive in Computer Management/Disk Management, the format option is grayed out. Therefore, I believe this means that I can't format the drive. However after File Explorer finally loads, it shows Drive D: but when accessed gives the error message "file directory is corrupt or unreadable". If I right click it in File Explorer, the format option is available.

    I have run the troubleshooter twice and it says that it fixed errors and needed a reboot but the problem remains.

    After that, every time I boot, CHKDSK attempts to run but I stop it.

    I did a search and found a suggestion to change the Registry entry at "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager" to "autocheck autochk *" but that is what the entry is (i.e. doesn't need to be changed). That same article suggested using the command "chkntfs /x D:"
    in an elevated command prompt to stop CHKDSK. I did this but now Windows restarts every time I shut it down!

    I've checked to see if the drives are dirty. Drive C: is not and Drive D: is inaccessable.

    I seem to be digging myself a bigger hole.

    Any suggestions how I can get out of this mess?

    Last edited by dsscottage; 30 Aug 2016 at 09:36.
      My System SpecsSystem Spec

  2.    31 Aug 2016 #2
    Join Date : Jan 2015
    UK, Midlands
    Posts : 5,803
    Win 10 Pro (1607)

    Hi, just a pointer: if you have the anniversary update, a number of people experience secondary or external drives being reported as RAW. This is one of the bugs MS is said to be working on. You can research that further, but MS's recommendation for now if you have this problem is to roll back to build 1511 -- but you only have (had?) 10 days in which to do so.

    That's assuming your problem is due to that.

    This is where disk imaging comes into its own, along with good backup practice - but I'm sure you're aware of that.

    [BUG] Windows 10 Anniversary Update Tanked Secondary Data Drive : Windows10
    Windows 10 Anniversary update problems, not recognizing external hdd - Page 3 - Windows 10 Forums
    16 Windows 10 Anniversary Update Issues How to Fix Them
      My System SpecsSystem Spec

  3.    31 Aug 2016 #3
    Join Date : Aug 2015
    Posts : 56
    Win 10 Pro X64, Win 10 Home X64, Win 7

    Problem fixed with a sledge hammer

    I have delayed the upgrade to the Anniversary edition so I still have 1511. (My system has the web cam and data on a secondary drive that are reported to be causing problems)

    I won't put anyone through the agony of my series of problems but in short, I tried many options to reformat the secondary drive and all failed. I even tried to do a system restore and it didn't work. Everything I tried seemed to make matters worse.

    In my ultimate frustration, I decided to do a fresh install of Win 10. That worked and I formatted the secondary drive in the process. Now I have a working Windows and my secondary drive is formatted and accessible.

    Now on the the agony of reinstalling all my software!
      My System SpecsSystem Spec

  4.    31 Aug 2016 #4
    Join Date : Aug 2014
    Forever West
    Posts : 2,152
    Win10 Home and Pro, Win7 Home, Linux Mint

    That is a problem with power failures/sudden power loss to a device. To avert that I have all my computers connected to a UPS/Uninterruptible Power Supply. One is a TrippLite and the others are APC.
      My System SpecsSystem Spec


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