Re: USB Port speeds
Hello Thomas,
Responses below for the suggested commands.
stream_recording seems to have nailed the issue down.
I did check for firmware updates on Pioneer website but none available
at the current time.
I read the man page regarding stream_recording but not sure that I fully
understand what the problem is exactly.
Since K3B wants to use growisofs does it have some ability to overcome
the problem?
One of my intentions for the BD-RE is script control backups under
cron. In the CLI scripts I can certainly use xorriso.
However, since the backups are very large tar files then error checking
becomes more important since tar files are essentially sequential in
nature and error stops all read operations Your thoughts on on reliability?
Thank you,
James
On 06/25/2013 05:21 PM, Thomas Schmitt wrote:
What speed reports do you get from
dd if=/dev/zero bs=1M count=1000 | xorriso -as cdrecord -v dev=/dev/sr0 -
This reported .9x to 1.2x
and from
dd if=/dev/zero bs=1M count=1000 | xorriso -as cdrecord -v dev=/dev/sr0
stream_recording=on -
This reported 2.0x and 100% buffer fill through the operation. (@ 8.6 MB/s)
Note: Both operations reported blank media with 0 sessions, 0 data
blocks, 0 data and 23.3g free at end.
Question: Because all zeroes were written?
Would I still have the same problem if directly attached to a SATA port? It
sounds like I would.
I did install drive in another machine on SATA port directly. Still
uBuntu 12.04 and no change in performance.
So USB is not part of the problem.
At this point I am not sure as to what is the best direction, look for
another drive or different media. Any thoughts from your past performance /
experiences?
Would drive firmware update help this issue (if available)?
I don't think it is a matter of the BD-RE media if they are
really formatted to 0 Spare area. Bad media would cause write
errors or read errors but should not be slow if Defect Management
is sucessfully disabled.
To verify that state, run
xorriso -outdev /dev/sr0 -list_formats
It should report before a list of format proposals:
Format status: formatted, with 23866.0 MiB
BD Spare Area: 0 blocks consumed, 0 blocks available
Confirmed - media reported 0 blocks for spare area and it also reported
blank.
It was new media I used for above after formating with dvd+rw-format
with -spare=none option.
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