Greyed out drive in DskMngmt

[DarthFaderZ]

New build has Asus M5a99x pro r2.0 mobo with UEFI bios. have a 256 SSD crucial and 3TB seagate barracude from an external I yanked from a back up drive.

seagate drive isn't showing up in 'my computer'. it does show up in disk managment with the 3 partitions I made previously trying to hook it up to my asus rtn66u router which it won't read due to a logic issue. so I thought I'd put it in the PC build i was doing. also shows up under device manager as ST3000DM001-1CH116

CMD - diskpart- volume list ; also fails to show it.

bios shows drives. ssd assigned to boot drive. won't let me do much else with it from what I have gathered. I have win 8.1-64bit .....

just at a loss for it is not accessible...nor has a drive letter. Downloaded seagates disc wizrd but it says it doesn't detect the drive either.

 

[lp231]

If you put it back to the external kit, will it work when connected to USB?
Try this, just download the free one
http://www.easeus.com/partition-manager/

 

[DarthFaderZ]

That's actually what I did and repartitioned with seagates DiscWizard. then moved it back into the desktop..and it wouldn't show...so I downloaded the program again...ran it again and repartitioned the drive and wiped it, assigned it to gpt, with ntfs, and it works like a charm now.