Hi,
I think the speed problem with the PX716A is related to growisofs. It seems that cdrecord with dvd support is not affected.
I have dvd+rw-tools version 5.21.4.10.8
dvd+rw-mediainfo /dev/hdc returns:
INQUIRY: [PLEXTOR ][DVDR PX-716A ][1.04]
GET [CURRENT] CONFIGURATION:
Mounted Media: 1Bh, DVD+R
Media ID: MCC/003
Current Write Speed: 12.0x1385=16620KB/s
Write Speed #0: 12.0x1385=16620KB/s
Write Speed #1: 8.0x1385=11080KB/s
Write Speed #2: 6.0x1385=8310KB/s
Write Speed #3: 4.0x1385=5540KB/s
Write Speed #4: 2.4x1385=3324KB/s
GET [CURRENT] PERFORMANCE:
Write Performance: 6.0x1385=8310KB/[EMAIL PROTECTED] -> 8.0x1385=11080KB/[EMAIL PROTECTED]
Speed Descriptor#0: 02/2294944 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
Speed Descriptor#1: 02/2294944 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
Speed Descriptor#2: 02/2294944 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
Speed Descriptor#3: 02/2294944 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
READ DVD STRUCTURE[#0h]:
Media Book Type: A1h, DVD+R book [revision 1]
Legacy lead-out at: 2294944*2KB=4700045312
READ DISC INFORMATION:
Disc status: complete
Number of Sessions: 1
State of Last Session: complete
Number of Tracks: 1
READ TRACK INFORMATION[#1]:
Track State: partial/complete
Track Start Address: 0*2KB
Free Blocks: 0*2KB
Track Size: 2294944*2KB
FABRICATED TOC:
Track#1 : [EMAIL PROTECTED]
Track#AA : [EMAIL PROTECTED]
Multi-session Info: [EMAIL PROTECTED]
READ CAPACITY: 2294944*2048=4700045312
I reported that with k3b/growisofs, DVD were burned at 4X when speed is set at 1, but at 12X when speed is set at 6 or 8:
$ growisofs -Z /dev/hdc -speed=1 somefile About to execute 'mkisofs somefile | builtin_dd of=/dev/hdc obs=32k seek=0' /dev/hdc: "Current Write Speed" is 4.1x1385KBps.
$ growisofs -Z /dev/hdc -speed=2 somefile About to execute 'mkisofs somefile | builtin_dd of=/dev/hdc obs=32k seek=0' /dev/hdc: "Current Write Speed" is 4.1x1385KBps.
$ growisofs -Z /dev/hdc -speed=4 somefile About to execute 'mkisofs somefile | builtin_dd of=/dev/hdc obs=32k seek=0' /dev/hdc: "Current Write Speed" is 6.1x1385KBps.
$ growisofs -Z /dev/hdc -speed=4.1 somefile About to execute 'mkisofs somefile | builtin_dd of=/dev/hdc obs=32k seek=0' /dev/hdc: "Current Write Speed" is 6.1x1385KBps.
$ growisofs -Z /dev/hdc -speed=5 somefile About to execute 'mkisofs somefiles | builtin_dd of=/dev/hdc obs=32k seek=0' /dev/hdc: "Current Write Speed" is 8.2x1385KBps.
$ growisofs -Z /dev/hdc -speed=6 somefile About to execute 'mkisofs somefiles | builtin_dd of=/dev/hdc obs=32k seek=0' /dev/hdc: "Current Write Speed" is 12.3x1385KBps.
$ growisofs -Z /dev/hdc -speed=8 somefile About to execute 'mkisofs somefiles | builtin_dd of=/dev/hdc obs=32k seek=0' /dev/hdc: "Current Write Speed" is 12.3x1385KBps.
$ growisofs -Z /dev/hdc somefile About to execute 'mkisofs somefiles | builtin_dd of=/dev/hdc obs=32k seek=0' /dev/hdc: "Current Write Speed" is 8.2x1385KBps.
There is apparently a problem when setting the speed. Maybe a rounding problem ?
Only speed=5 or no set speed make the drive use 8.2X. 6.1X speed is settable with 4.1. speed=4.2 sets 8.2X.
However, with cdrecord (with GPL dvd patches), I get:
cdrecord dev=ATA:1,0,0 speed=8 someiso.iso
Device type : Removable CD-ROM
Version : 0
Response Format: 1
Vendor_info : 'PLEXTOR '
Identifikation : 'DVDR PX-716A '
Revision : '1.04'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.
cdrecord: Found DVD media: using cdr_mdvd.
Using Session At Once (SAO) for DVD mode.
Using Session At Once (SAO) for DVD mode.
Using Session At Once (SAO) for DVD mode.
Using generic SCSI-3/mmc DVD-R(W) driver (mmc_mdvd).
Driver flags : SWABAUDIO BURNFREE
Supported modes: PACKET SAO
Speed set to 16620 KB/s
cdrecord: Drive needs to reload the media to return to proper status.
scsi_set_streaming
Speed set to 11080 KB/s
Starting to write CD/DVD at speed 8.0 in real unknown mode for single session.
It sets the speed correctly after reloading the media. So the behaviours of the drive might be correct.
Regards, Eric
-- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
