I had recently decided to set up a dual boot on my solid state, but I did not touch the hard drive itself. Now when I go into Windows (and linux) the drive isn't lettered anymore. Is there a way to re-letter it? Thanks in advanced.
@Suztera is right, using the Windows OS you should go and check Disk Management and how the drive is listed there. Re-lettering an internal HDD would re-format it, which means erasing your data. So make sure you have a backup of the data there elsewhere, otherwise you'd lose it.
Here are a couple of tutorials from our kb that might help you re-initialize and then re-format your HDD.
How to initialize it: http://products.wdc.com/support/kb.ashx?id=JTXY5q
How to partition & format it: http://products.wdc.com/support/kb.ashx?id=kXRDkI