Is there a difference between ATA-7 & PATA?
An ATA-7 type hard drive is the first generation technology of SATA (SATA 1.0), only capable of transferring data at 1.5Gbit/s meanwhile a PATA hard drive uses a ribbon cable to transfer data. In the end a SATA is capable of being faster, but it really depends on the RPM of the HDD and the cache. Yes, you can use them interchangeably as long as your motherboard supports both types of hard drives; they will appear as two different drives on your computer.