Sony will begin selling an after-market Blu-ray Disc drive next month that can be added to existing desktop computers.The BWU-100A drive supports burning to single- and dual-layer BD-R (single use) or BD-RE (rewritable) discs. A single-layer disc can store up to 25GB of data or about\u00a0two hours of high-definition video, and the dual-layer disc can accommodate double these amounts.Sony will ship the drive with CyberLink\u2019s BD Solution burning software. The drive can write at 2X Blu-ray Disc speed, so burning a full 25GB disc takes about 50 minutes, Sony said.Additionally, the drive can burn single-layer 4.7GB DVD+\/-R\/+\/-RW\/RAM discs, 8.5GB DVD+R double\/dual layer discs, and CDs.The drive has an ATAPI interface and fits into the standard half-height drive bay that exists in most desktop PCs. Sony recommends minimum computing power of a Pentium III 800MHz or faster processor for data burning. For real-time video authoring and editing, a Pentium IV 1.6GHz or faster is recommended.Sony cautions that additional software and hardware is required for playback of commercial movies on Blu-ray Disc (BD-ROM), but the company didn\u2019t specify exactly what is required.The drive will cost US$750 in North America. Sony has not announced pricing or availability for other markets.-Martyn Williams, IDG News Service (Tokyo Bureau)Check out our CIO News Alerts and Tech Informer pages for more updated news coverage.