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Explorer does not show HDD

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#1
In this photo you should see 4 Discs. Only 3 are recognized. Besides the 60 Gb SSD (B & C) and the 1 Tb HDD (D) there is another 1 Tb sata2 HDD attached also, but is not displayed for whatever reason...



HD Tune shows the HDD, but no letter is assigned to it. A month ago there were no problems and the HDD would quickly appear in My Computer.

I am dull founded. I inserted another drive - another SSD instead of HDD - same result.
I changed AHCI to IDE - nothing.
I formatted the HDD in Windows setup to NTFS - same nothing.

Obviously it is not a hardware problem as both the SSD and HDD are independently not recognized, something is messed up with Windows, i have no clue what!!! Windows search is enabled.
 
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#2
Have you tried going into disk management and seeing if the drive is there? If it is, you should be able to assign it a letter. If it is not visible there, you might have a HW/Driver problem with the SATA controller.
 
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#3
The drive is visible in disc management, but written is "unallocated space".

What to do?
 

anoobarak

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#4
Right-click on the unallocated space and make a new partition of your desired size.
 
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Processor Intel Core i7 5775C
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Power Supply Corsair AX860
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#5
When you buy a new HDD, is it by default FAT32?
 

erocker

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#6