We needed more space on our Windows 2003 server standard, so we added an external drive array (MicroNet) that has four 500 GB drives and connects via a single eSATA. We purchased a PCI - eSATA card that does RAID (Sil 3124r5) and configured two mirrored arrays (RAID1). We moved our Exchange database onto one of the RAID1 arrays, which seemed to work OK at first, but then would occassionally hang or slow down. So we thought we would move all the graphics over and bring the Exchange database back. This was worse - especially for the Macs. It took several minutes just to get a folder listing. I ran a disk benchmark on the drives and found that the Access time was much slower for the external drive, but the read and cached time wasn't out of line. Any thoughts on why this external is slow? I thought by using eSata we wouldn't really notice a difference. Is it our RAID card, just the single eSata cable - or do we need SCSI??