Why won't my external drive mount in Lion when it will mount in Snow Leopard?

Hello,
I have an external hard drive, a Rocstor Arcticroc 4T, that will not mount on my Mac Pro running OS 10.7.4.  It will mount when I connect it to my other system running OS 10.6.8, or when I boot to an alternate partition on the same system running OS 10.6.8.  I've tried using the latest versions of Disk Warrior and Drive Genius to repair/rebuild/reformat the drive with no success. 
When I boot to OS 10.7.4 the disk shows up in Disk Utilities, but the volume is grayed out.  When I select the volume and try to mount it I get the following error:  "The disk "Media 3" could not be mounted.  Try running First Aid on the disk and then retry mounting."  I've run repair disk numerous times, with no errors reported.
There is no media on the drive, so I can re-partition, reformat or change the RAID configuration with no consequences.
Any help would be greatly appreciated.
Thanks,
-Jim

the drive case needs drivers and or firmware. Happens all the time esp. with many makes and vendors due to the bridge it uses, that does the SATA drive <=> to FW/USB/etc to your Mac and whether you use FW800/400 or USB2 or even eSATA (w/ a PCIe SATA controller).
If you are using native SATA and an PCIe SATA controller.... tell us! and the vendor needs to provide drivers that are not included with Lion. Lion just 'broke' support it has had with Snow Leopard.
As for RAID - a RAID created with SL will not always support Lion for booting or mount. Happened with 10.3.9 too. And SL would not install on a RAID created with Leopard. See the pattern emerging?

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