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A/V Introduction/Goals

A/V Introduction/Goals. Goals Improved capability to continuously stream data Additional error reporting for A/V applications Permit A/V-specific applications as well as mixed A/V and PC applications Overview New Set A/V Configuration command New Read and Write A/V commands

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A/V Introduction/Goals

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  1. A/V Introduction/Goals • Goals • Improved capability to continuously stream data • Additional error reporting for A/V applications • Permit A/V-specific applications as well as mixed A/V and PC applications • Overview • New Set A/V Configuration command • New Read and Write A/V commands • Reporting of Unrecoverable Read Errors and Deferred Write Errors • Allows both PIO and DMA A/V data transfers • Primarily for LBA addressing, CHS not fully supported

  2. A/V Data Transfer Periods • A/V Read and Write Recovery Time Limits are allotted times for complete command execution • Commands shall execute in the specified time period including data transfer and final status • Recovery Time Limits are not individually selectable on a per stream basis as currently defined • Host will typically transfer an application specific amount of data per period

  3. Read A/V Stream Command • URGent is a temporary overide to the Recovery time limit and effectively means “As Soon As Possible” • The actual action performed by the drive when URG is specified is vendor specific • Stream ID is a hint that indicates which stream the command is associated with • Use of or behavior specific to Stream ID is vendor unique

  4. Things That Are Missing... • Acoustic Seek Modes • Useful feature - No objection to SeaStream’s implementation • WD doesn’t believe this is A/V specific, i.e., PCs may very well want to trade lowered acoustics for performance • PIO is not missing… • Feedback indicates PIO transfer adequate for some A/V applications currently • Buffering in drive can alleviate some of the performance deficit associated with PIO transfers • Stream Rate Negotiation • Some Features Not Adequately Defined Yet • Updated document with clarifications will be available “soon”

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