Hm?
I have a 1 TB WD in my MacBook Pro right here. What do you mean?
It's a 12.5 mm height -- a bit much for some bays, but fits fine here. A Z of 15 mm is substantially larger.
Had it in for more than a month now. Cheap, too.
Seagate has announced the industry's first 7200rpm internal-fit 1TB capacity 2.5-inch hard drive, the Constellation 2. The drive is made for server storage applications, including direct-attached, network-attached and SAN storage, and, as expected, has a 6Gbit/s interface, both SATA and SAS, and capacity points of 250GB, 500GB …
The Seagate is a 7200RPM and not 5200RPM model. It also has 64MB of cache rather than 8MB. Not to mention SATA and SAS with 6Gbits/s. So, as The Reg said:
"Seagate has announced the industry's first 7200rpm internal-fit 1TB capacity 2.5-inch hard drive, the Constellation 2." The WD is not a 7200RPM model.