Xen devel - Mar 2006 - Virtual Block Device: frame_and_sects in blkif_request_t

Could someone explain the frame_and_sects field of blkif_request_t(on
2.0.7) for me. From what I make out from the bsd and linux drivers,
these entries specify a machine frame and the section of the machine
frame to write from/copy to. Where I''m confused is the definition of
the size of these sections. Are they each 512 bytes in size?
Then there is the sector_number field. Are all requests written within
this sector, with the second entry in frames_and_sects being written
directly after the first entry which is written at the very start of
the segment, etc?
Regards
Ivan Kelly

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