I am using 64-bit Win 7 on a Del Precision T7400 workstation. I am a refugee from Acronis and am very happy with the reliability of Paragon Drive Backup 10 Professional. However, while performing some backup runs with Drive Backup, I have noticed a difference in backup speed depending on selection of the archive drive. My system has three SATA disk drives and one controller. Two of the drives are 500 GB, and the third is a 1 TB drive. I have performed some timing runs while backing up my C: (system) partition, which is on Disk 0 and have discovered that the backup time is about 70% longer when backing up to the backup capsule, which is located in its own 419 GB partition on the 1 TB Disk 2 drive. The other archive location is on a 256 GB NTFS partition on Drive 1. I am guessing that the cylinder bit density may be different on the 1 TB drive, because when I purchased the drive mention was made that it used the new perpendicular recording technique. Perhaps the two 500 GB drives use the older lower density longitudinal recording method. I would like to know if anyone else has noticed this speed difference? Comments and suggestions will be appreciated.