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UEFI, BIOS, and inaccessible drives

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#1 LH47


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Posted 14 January 2016 - 10:14 AM

OK...I've had success in changing the settings for installing Win 8 or Win 7 on the same system. I think I get it.


But every time I try to slave a Win 8 HDD to my system (either to a Win 7 or Win 8.1 system) I get an "inaccessible" error.  Taking ownership does not work, since the options are all greyed out.


Last time, I finally ended up using an elevated command prompt to access and copy the files I needed from a Win 8 drive. Them oddly, after that, the drive became briefly accessible.


But when I tried to wipe the drive clean (using Disk Management) the options to delete partition, etc, were also greyed out, and it was inaccessible again - no "Format" options in My Computer, either. So I finally had to use diskpart  to return it to "Unallocated Space". (Then Windows Disk Management worked.)


Does anyone know why this is happening, and if there is a less time-consuming workaround?



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#2 dc3


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Posted 15 January 2016 - 10:41 AM

Windows will protect the partition which the operating system is installed on.  That partition is grayed out so it can't be accidentally or intentionally altered.


What exactly are you trying to accomplish?


Are you trying to install both Windows 7 and Windows 8.1?

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#3 LH47

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Posted 15 January 2016 - 04:25 PM

On 3 separate occasions, I have tried to retrieve some files from am un-bootable hard drive by pulling the drive and slaving it to another system (Both win 7 and Win 8.1). This could only be accomplished with a command prompt. I could not even take ownership of these drives, since that option was always greyed out.


(Wonder if I could have done this with the command prompt option on a win 8 boot disk? I didn't try an Ubuntu Cd, either...)  Just curious as to why these drives are suddenly "inaccessible"...

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