Packet and cdrom interface differences

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Hello everyone.
What is the actual difference between characteristics of packet writing
device and plain writable ide /dev/dvd for dvd+-rw media.

They both seem to serve the same purpose but I observed vast differences.

1. even if writing operation on udf formated media is completed in both
cases, the plain dvd seems to have very inefficient elevation strategy
virtually killing the drive with excessive seeks. This happens both in case
of many small files as well as a single large one. The pkt device is much
smoother and in turn faster in both cases.

2. Some Udf disks written through the pkt interface are erratically read
through plain device in rw mode (which look to be a more file system
interpretation problem that sector level io). They are hovewer correctly
read by dvd device in ro mode.

Another question is how to best tune mkudffs parameters in case of both
dvd+rw and cdrw to minimize seeks and maximize writing speed?
The pkt driver reports fixed 64k packets for my drive. The usage pattern is
incremental only medium file writes, with occasional overwrites so the
fragementation is not a concern form me.

Best regards,
DS.

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