A very common drive that shipped in early 2010s computers was the Hitachi Deskstar 7K1000.C. However, the Ultrastar version of that drive was marketed as an A7K2000 and has model numbers to suggest such, even though the drive is clearly a different drive to the actual A7K2000 (the 2 TB version), whose Deskstar counterpart is the 7K2000, which was only available as a 2 TB drive. Why would Hitachi have used two different names for the two different Deskstar drives, but called both of their Ultrastar counterparts the same name, even though the 2 TB and 1 TB versions are completely different drives? You would think they would have called the 1 TB one the Ultrastar A7K1000.C, since it looks and sounds just like the Deskstar 7K1000.C and not the Deskstar 7K2000.