Windows Server 2012 R2
1TB HDD with 3 Primary Partitions and the 4th slot an Extended Partition divided into the following Logical Drives:
P: - 40GB
Q: - 12GB
R: - 12GB
S: - 12GB
T: - 100GB
U: - 60GB
V: - 240GB
W: - 160GB
Free Space - 150GB +/-
All the Logical Drives show in Windows Explorer, with the exception of T: - T: is not visible. A share in T: does successfully map as a network drive (probable red herring). Shares in T: are visible by browsing the Network Shares.
All the information in T: is accessible in Windows Explorer by typing T: in the address bar.
ChkDsk doesn't reveal any physical problems.
The Administrator account I am using can see all other drives.
Security permissions appear to be the same for T: as all other drives (Full Control by Security Group and also explicitly by Admin account name)
T: is visible in Disk Management, just not on the left side under This PC in Windows Explorer.
We have restarted multiple times, turned off, unplugged, cleared capacitors, waited, etc.
T: is 90% full before moving the data off and reformatting. After reformatting the Logical Drive, the drive does not show even with 0 data on it. Adding sample data does not help.
I moved the data off T: and reformatted the Logical Drive using Z: as the selected drive letter (same space, just a new format and drive letter). Restarted. Still doesn't show up, even though S: and U: on either side (as well as all other drives) are visible.
Only the Default Domain Policy that is standard out of the box for Microsoft is applied or even enabled at this point (I took them all off to make sure).
I was unable to Google anything that even seemed to address the problem (Logical Drive not showing in Windows Explorer and various other combinations).
I have not personally seen this problem before and before I move all my data off the drive and start over, I am hoping for a solution. I have a lot of time in the various shares and permission sets and I am guessing it is something simple :)