Redundant arrays of independent disks work on the principal that having the same data backed up on multiple drives reduces your chances of losing data. It makes sense that if your data is valuable (and all data is valuable) you don't want to put all of your eggs in one basket by backing up to a single drive that could go south. Promise Technology's SuperTrak SX6000 ATA RAID controller card is a device that offers RAID Levels 0, 1, 0+1, 3 & 5 for up to six high-capacity (and fairly inexpensive) Ultra ATA/100 drives for those of you who put your trust in the Department of Redundancy Department. SuperTrak SX6000 works with Windows 2000/NT4 and Linux and includes a 100MHz i960RM RISC chip, hardware-based parity processing for RAID 3 and 5 arrays, hot swap, and hot spare support. The card and three SuperSwap removable drive chassises are also available as SuperTrak SX6000 Pro if you want to put a hot swappable RAID 5 storage system in place. SuperTrak SX6000 houses six independent Ultra ATA drive channels, each designed to hold a single Ultra ATA drive. Large LBA support in the BIOS allows each attached drive to exceed 137GB for massive arrayed storage capacity. SuperTrak SX6000 lets you use an unassigned, attached hot spare drive for rebuilding of data in case of drive failure. When used with the SuperSwap hot swap drive chassises, the card allows replacing a failed drive without powering down your system in the event of a failed drive. A single memory cache slot lets your slap in a standard 168-pin DIMM ECC or non-ECC SDRAM (16MB minimum to 128MB maximum, unbuffered). SuperTrak SX6000 lists at $299. The Pro version, which includes 3 Promise SuperSwap drive enclosures, will list at $479.