: Complete Drive Backup">
The 20GB USB and PC Card-attached ABSplus drives were tested on our two year old IBM ThinkPad T20 notebook using an IBM Travelstar 20GN (model DJSA-220) 4200rpm, UDMA/66 drive. Our tests consisted of backing up 14GB of data from the notebook, which includes over 70,000 files and 3300 directories.
First we conducted an entire system backup. This test reflects a typical user experience when installing the product for the first time. We did not modify user data or ABS drive settings, and we did not perform a defragmentation of the drive before backing up. However, we did disable Norton AntiVirus for all backup runs.
Youll note slight variations in the number of files backed up, which may be due to some temporary files that may have been created between backups, or more likely additional driver files loaded when setting up the USB device. We completely uninstalled and reinstalled ABS Backup software between each run of the different device types, because the USB and PC Card devices cannot be installed for backup concurrently.
As you can see in the results above, the USB 1.1 version was about 13% faster, but both still took a very long time over seven hours even though it was a backup of the entire disk. Clearly, bottlenecks existed elsewhere, because CardBus transfers should be much faster than USB 1.1. Reading and writing a mix of random and sequential data from two 4200rpm drives across large expanses of the disk surface likely was the main bottleneck, along with possible driver inefficiencies. Compared to typical 40GB DAT tape backup solutions that claim 200+MB/minute speeds transferring compressed data, the ABSplus drives are slow. But in both ABSplus cases, we ran the full system backups overnight, so it really didnt matter much.
We expected the PC Card device to outperform the USB device, because the notebook only supports USB 1.1, and CMS informed us that the PC Card device is a CardBus device (PCI signal translations, not ISA signal translations).