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Wodim and ramping up speed


I was just wondering if this is proper as it struck me as odd.

I know that the maximum data throughput on a device is a function of the radius
and rotation speed, but why doe the disc speed (not write speed) change?

In fact it changes when the write speed changes too.

jpyeron@phoenix /cygdrive/c/Documents and Settings/All
Users/Desktop/video/target
$ wodim-pipe -udf .
I: -input-charset not specified, using us-ascii (detected in locale settings)
TOC Type: 3 = CD-ROM XA mode 2
[snip]
scsidev: '/dev/cdrw1'
devname: '/dev/cdrw1'
scsibus: -2 target: -2 lun: -2
Wodim version: 1.1.7.1
Driveropts: 'burnfree'
SCSI buffer size: 64512
Device type    : Removable CD-ROM
Version        : 0
Response Format: 2
Capabilities   :
Vendor_info    : 'PBDS    '
Identification : 'DVD+-RW DS-8W1P '
Revision       : 'BD1B'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.
Current: 0x0011 (DVD-R sequential recording)
Profile: 0x002B (DVD+R/DL)
Profile: 0x001B (DVD+R)
Profile: 0x001A (DVD+RW)
Profile: 0x0015 (DVD-R/DL sequential recording)
Profile: 0x0014 (DVD-RW sequential recording)
Profile: 0x0013 (DVD-RW restricted overwrite)
Profile: 0x0011 (DVD-R sequential recording) (current)
Profile: 0x0010 (DVD-ROM)
Profile: 0x000A (CD-RW)
Profile: 0x0009 (CD-R)
Profile: 0x0008 (CD-ROM)
Using generic SCSI-3/mmc DVD-R(W) driver (mmc_mdvd).
Driver flags   : SWABAUDIO BURNFREE
Supported modes: PACKET SAO
Drive buf size : 1182464 = 1154 KB
Beginning DMA speed test. Set CDR_NODMATEST environment variable if device
communication breaks or freezes immediately after that.
FIFO size      : 104857600 = 102400 KB
Track 01: data  4339 MB
Total size:     4983 MB (493:43.89) = 2221792 sectors
Lout start:     4983 MB (493:45/67) = 2221792 sectors
Current Secsize: 2048
HINT: use dvd+rw-mediainfo from dvd+rw-tools for information extraction.
Blocks total: 2298496 Blocks current: 2298496 Blocks remaining: 76704
Speed set to 11080 KB/s
Starting to write CD/DVD at speed   8.0 in real unknown mode for multi session.
Last chance to quit, starting real write in    4 seconds.  0.23% done, estimate
finish Mon May 11 12:28:09 2009
   2 seconds.  0.45% done, estimate finish Mon May 11 12:24:26 2009
   1 seconds.  0.68% done, estimate finish Mon May 11 12:23:13 2009
   0 seconds. Operation starts.
Waiting for reader process to fill input buffer ...   0.90% done, estimate
finish Mon May 11 12:22:36 2009
  1.13% done, estimate finish Mon May 11 12:22:14 2009
  1.35% done, estimate finish Mon May 11 12:23:13 2009
  1.58% done, estimate finish Mon May 11 12:22:52 2009
  1.80% done, estimate finish Mon May 11 12:22:36 2009
  2.03% done, estimate finish Mon May 11 12:22:24 2009
input buffer ready.
Performing OPC...
Starting new track at sector: 0
Track 01:    0 of 4339 MB written.  2.25% done, estimate finish Mon May 11
13:14:04 2009
Track 01:   10 of 4339 MB written (fifo  99%) [buf  99%]   2.0x.  2.48% done,
estimate finish Mon May 11 13:11:55 2009
Track 01:   20 of 4339 MB written (fifo 100%) [buf  98%]   2.0x.  2.70% done,
estimate finish Mon May 11 13:09:30 2009
Track 01:   30 of 4339 MB written (fifo 100%) [buf  98%]   2.0x.  2.93% done,
estimate finish Mon May 11 13:07:28 2009
[snip]
Track 01:  225 of 4339 MB written (fifo 100%) [buf  97%]   2.1x.  7.43% done,
estimate finish Mon May 11 12:51:03 2009
Track 01:  235 of 4339 MB written (fifo 100%) [buf  99%]   2.0x.  7.65% done,
estimate finish Mon May 11 12:50:48 2009
Track 01:  244 of 4339 MB written (fifo 100%) [buf  96%]   2.1x.  7.88% done,
estimate finish Mon May 11 12:50:35 2009
Track 01:  254 of 4339 MB written (fifo 100%) [buf  98%]   2.1x.  8.10% done,
estimate finish Mon May 11 12:50:22 2009
Track 01:  264 of 4339 MB written (fifo  99%) [buf  99%]   4.1x.  8.33% done,
estimate finish Mon May 11 12:50:34 2009
Track 01:  274 of 4339 MB written (fifo 100%) [buf  98%]   4.0x.  8.55% done,
estimate finish Mon May 11 12:49:59 2009
Track 01:  283 of 4339 MB written (fifo 100%) [buf  99%]   4.1x.  8.78% done,
estimate finish Mon May 11 12:49:25 2009
Track 01:  293 of 4339 MB written (fifo 100%) [buf  97%]   4.1x.  9.00% done,
estimate finish Mon May 11 12:48:53 2009
Track 01:  303 of 4339 MB written (fifo 100%) [buf  95%]   4.0x.  9.23% done,
estimate finish Mon May 11 12:48:12 2009
[snip]
Track 01: 1631 of 4339 MB written (fifo 100%) [buf  94%]   4.2x. 39.83% done,
estimate finish Mon May 11 12:31:55 2009
Track 01: 1641 of 4339 MB written (fifo  99%) [buf  94%]   4.2x. 40.06% done,
estimate finish Mon May 11 12:31:54 2009
Track 01: 1651 of 4339 MB written (fifo  99%) [buf  99%]   4.1x. 40.28% done,
estimate finish Mon May 11 12:31:53 2009
Track 01: 1660 of 4339 MB written (fifo  99%) [buf  98%]   4.2x. 40.51% done,
estimate finish Mon May 11 12:31:51 2009
Track 01: 1670 of 4339 MB written (fifo  99%) [buf  96%]   6.3x. 40.73% done,
estimate finish Mon May 11 12:31:58 2009
Track 01: 1680 of 4339 MB written (fifo  99%) [buf  99%]   6.2x. 40.96% done,
estimate finish Mon May 11 12:31:56 2009
Track 01: 1690 of 4339 MB written (fifo  99%) [buf  96%]   6.1x. 41.18% done,
estimate finish Mon May 11 12:31:53 2009
Track 01: 1699 of 4339 MB written (fifo  99%) [buf  90%]   6.3x. 41.41% done,
estimate finish Mon May 11 12:31:49 2009
Track 01: 1709 of 4339 MB written (fifo  99%) [buf  96%]   6.3x. 41.63% done,
estimate finish Mon May 11 12:31:45 2009
[snip]
Track 01: 3682 of 4339 MB written (fifo  49%) [buf  92%]   6.1x. 85.97% done,
estimate finish Mon May 11 12:27:02 2009
Track 01: 3697 of 4339 MB written (fifo  44%) [buf  93%]   6.2x. 86.19% done,
estimate finish Mon May 11 12:27:02 2009
Track 01: 3709 of 4339 MB written (fifo  41%) [buf  95%]   6.2x. 86.42% done,
estimate finish Mon May 11 12:27:02 2009
Track 01: 3712 of 4339 MB written (fifo  41%) [buf  96%]   6.3x. 86.64% done,
estimate finish Mon May 11 12:27:02 2009
 86.87% done, estimate finish Mon May 11 12:27:01 2009
Track 01: 3736 of 4339 MB written (fifo  44%) [buf  88%]   8.2x. 87.09% done,
estimate finish Mon May 11 12:27:04 2009
Track 01: 3761 of 4339 MB written (fifo  28%) [buf  93%]   8.2x. 87.32% done,
estimate finish Mon May 11 12:27:04 2009
Track 01: 3778 of 4339 MB written (fifo  21%) [buf  94%]   8.4x. 87.54% done,
estimate finish Mon May 11 12:27:04 2009
Track 01: 3792 of 4339 MB written (fifo  16%) [buf  95%]   8.1x. 87.77% done,
estimate finish Mon May 11 12:27:03 2009
Track 01: 3806 of 4339 MB written (fifo  11%) [buf  90%]   8.2x. 87.99% done,
estimate finish Mon May 11 12:27:02 2009
[snip]
Track 01: 4239 of 4339 MB written (fifo  99%) [buf  94%]   8.3x. 99.92% done,
estimate finish Mon May 11 12:26:10 2009
Track 01: 4242 of 4339 MB written (fifo  99%) [buf  94%]   8.0x.Total
translation table size: 0
Total rockridge attributes bytes: 0
Total directory bytes: 836
Path table size(bytes): 10
Max brk space used 30000
2221792 extents written (4339 MB)
Track 01: 4339 of 4339 MB written (fifo 100%) [buf  98%]   8.1x.
Track 01: Total bytes read/written: 4550230016/4550230016 (2221792 sectors).
Writing  time:  766.531s
Average write speed   4.4x.
Min drive buffer fill was 71%
Fixating...
Fixating time:   19.237s
wodim: fifo had 71671 puts and 71671 gets.
wodim: fifo was 13 times empty and 25896 times full, min fill was 0%.

jpyeron@phoenix /cygdrive/c/Documents and Settings/All
Users/Desktop/video/target
$



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