Buyers are using our VT6421A Serial ATA & IDE RAID PCI Card to modify their XBOX 360. The VT6421L chipset is apparently an easier chipset to work with, but VT6421A is currently widely available. Many sellers that claim to sell VT6421L may actually be selling VT6421A. Around Nov/Dec 2006 is about the last time VT6421L was available (Syba VIA-150-R for example), but even they are using VT6421A chipset now. So, if are on the hunt for VT6421L please get confirmation from the vendor before you make your purchase. We bought two from novadoom88 on eBay that claimed to be selling VT6421L but was actually selling VT6421A. No response from seller and had to go through Paypal to process a return.