Ahh, sorry. :)
All the drives are 3Gb/s capable drives. All the drives reported as 1.5 should be 3. If you look at the report, the models of the two hard drives in questions are:
Line 2590 - ST3500630NS - This is a Seagate Barracuda ES drive, 3Gb/s, 7200 RPM
Line 2638 - GB0160CAABV - This is a...