Hi there, any help will be greatly appreciated.
I have two external enclosures OWC Mercury Elite pro with Sata drives in them. They work fine in my friend's Mac, but my computer will not recognize them at all.
I am on a dual boot Windows 7 Professional 64 bit with Linux Debian 7 Wheezy 64 bit and neither operating system sees the drives at all.
On Windows 7 the Disk Management screen shows nothing. On the linux side, Gparted does not see them when scanned.
My Motherboard is a Gigabyte GA-A75M-S2V set in AHCI mode, but the motherboard does not seem to detect the HDD, or maybe I don't know how to enable it. I have read the manual but it only explains the essentials.
vendor: Gigabyte Technology Co., Ltd.
width: 64 bits
SMBIOS version 2.4,
DMI version 2.4,
I notice that my operating system is 64 bit while the BIOS info says "32 bit processes".
I have two other external HDD that are being detected without any issues, one is an old technology (IDE?) and the other one is a pretty new Toshiba USB 3.0
I inherited the unrecognized enclosures from a friend that bought them for his Mac, and I see that they are being sold by a Mac specialized online store. I also notice that in the product page they call it "Raid Storage" and I remember that there was a Raid setting in the BIOS, but to be honest I don't yet understand the IDE AHCI RAID settings.
Here is my CPU info:
vendor: Advanced Micro Devices [AMD]
bus info: cpu@0
version: AMD A6-3670 APU with Radeon HD Graphics
slot: Socket M2
width: 64 bits
Here is my Host Bridge info:
vendor: Advanced Micro Devices [AMD] 
bus info: pci@0000:00:00.0
width: 32 bits
thanks so much !