I ordered a 3 TB hard drive for a friend of mine. I got it from newegg and wanted to format it before I took it to him, I tried it in a Thermaltake Black X usb dock, and it only seen it as like 734 G or something like even when using GPT partition type, so after looking around the web, I decided that it would not work in the dock. (windows 7 x64) I hooked it up in my computer and away I went, 2.7T of space or so, all is well right.... So I take it to him and hook it up to his Dell T1600 (internal) and it does not even show up in disk manager (windows 7 x64)- Look in Bios and it showed it but only like 800G or so in bios, but not at all in windows. I updated the bios on his dell to the newest one, and also updated the intel storage driver to the newest version also. No luck. Any thoughts? Also, since the 3T will not work, what is the biggest size that will 1.5, 2, ect.... Need to get a drive for internal and then going to get an external drive of the same size to use as backup. noted: this is not for a boot drive it will be a second disk for data storage. Many thanks!