1. AV Interface Commands Set T13 History WD Proposal Seagate Proposal ATA 6 (Streaming Cmd Set Not approved moved to ATA 7) ATA 7 Streaming Cmd Set Time Limited Proposal A/V Lite Proposal 1999 2001 2002 Streaming Cmd Set Complicated Host and Device Vendors discovered: Complex & Requires New Cmds Much Much more testing required Code space for HDD mfg’s Complicated Host drivers Time-Limited R/W Mode No New Commands Needed Easy to test (same R/W cmd as today's) Command Time-Out per Cmd GROUP: Time-Out Default fits all commands 28 & 48bit LBA

2. A/V Lite Advantages Simpler Host and Device Drivers No New Commands Uses existing Read DMA & Write DMA commands Therefore, no unique process requirements for AV Drive Reliability, compatibility, testing processes of PC drive apply to AV drive Command Time-Out Host configurable for a Group of Commands On/Off and Tunable via Set Features (Similar to Configure Stream Cmd) No re-communication required if time-out value does not change Performance averaged over a Group of Commands Simpler Error Handling & Recovery

3. How it works… Set features (max time=xx millisecs) - - - Flush cache(stop, preset timer) - - - Read (or write) dma(starts timer,access data) Read (or write) dma(access stream data) - - - Flush cache(stop, preset timer) - - - Read (or write) dma(starts timer,access data) Read (or write) dma(access stream data) - - - Flush cache(stop, preset timer) - - - Time < xx millisecs No time limit

4. Why change ? Keep it simple Customers want standards Code space Ease of test What’s next ? Vote to add/offer a simpler solution to ATA 7 Show our customers we want what is best