## MMPM/2 Device Driver Reference

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### MCI_AUDIO_INIT Field - lBsize

lBsize (LONG) Indicates the data block size for blocked data. Some devices perform I/O in fixed block amounts. For these devices, a full block of data must be written to the device driver before it is written to the device (during playback). During Record operations, a full block of data must be received before it becomes available to the application. The lBsize field should be less than or equal to 1024 bytes, however, it cannot be guaranteed not to exceed that size.