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how do I avoid buffer underrun?
I'm trying to write a dual-layer blu-ray using the schily cdrecord
Cdrecord-ProDVD-ProBD-Clone 3.01a06 (x86_64-unknown-linux-gnu) Copyright (C) 1995-2011 Joerg Schilling I can create an ISO image that's 38,961,047,552 bytes, which should fit on a 50G dual-layer blu-ray disk. I am having trouble writing the image onto the disk. I get a message about buffer underruns, and need some help fixing this. Thanks for any help you can give, Chelmite I created the iso image with: % mkisofs -o /media/Maxtor2/Backups/maxtor3.iso -r -J -hide-rr-moved - V "Backup 2011/11/20" -publisher "Chelmite" -iso-level 4 -graft-points photos/M3/Photos=/media/M3/Photos photos/M3/JDroid=/media/M3/Backups/ Droid/JDroid/dcim photos/M3/TDK-Vibrant=/media/M3/Backups/Droid/ JVibrant/DCIM photos/M3/SDroid=/media/M3/Backups/Droid/SDroid/dcim photos/M3/SVibrant-KD=/media/M3/Backups/Droid/SVibrant1/KDROID32/dcim photos/Maxtor3/SVibrant-SD=/media/M3/Backups/Droid/SVibrant1/SDROID/ DCIM Warning: Creating ISO-9660:1999 (version 2) filesystem. Warning: ISO-9660 filenames longer than 31 may cause buffer overflows in the OS. Then I tried to write the iso: % /opt/schily/bin/cdrecord tsize=19023949s -dao fs=12m speed=-1 driveropts=burnfree dev=/dev/sr1 - /media/Maxtor2/Backups/ maxtor3.iso Cdrecord-ProDVD-ProBD-Clone 3.01a06 (x86_64-unknown-linux-gnu) Copyright (C) 1995-2011 Joerg Schilling scsidev: '/dev/sr1' devname: '/dev/sr1' scsibus: -2 target: -2 lun: -2 Warning: Open by 'devname' is unintentional and not supported. Linux sg driver version: 3.5.27 Using libscg version 'schily-0.9'. Device type : Removable CD-ROM Version : 0 Response Format: 2 Capabilities : Vendor_info : 'PIONEER ' Identifikation : 'BD-RW BDR-206D' Revision : '1.56' Device seems to be: Generic mmc2 DVD-R/DVD-RW/DVD-RAM. Using generic SCSI-3/mmc-3 BD-R driver (mmc_bdr). Driver flags : NO-CD BD MMC-3 BURNFREE Supported modes: PACKET SAO LAYER_JUMP cdrecord: Warning: Cannot read drive buffer. cdrecord: Warning: The DMA speed test has been skipped. WARNING: Phys disk size 4452354 differs from rzone size 24438784! Prerecorded disk? WARNING: Phys start: 25088 Phys end 4477441 Starting to write CD/DVD/BD at speed 8 in real SAO mode for single session. Last chance to quit, starting real write 0 seconds. Operation starts. cdrecord: Input/output error. write_g1: scsi sendcmd: no error CDB: 2A 00 00 BA 74 10 00 00 10 00 status: 0x2 (CHECK CONDITION) Sense Bytes: 70 00 05 00 00 00 00 0E 00 00 00 00 21 02 00 00 Sense Key: 0x5 Illegal Request, Segment 0 Sense Code: 0x21 Qual 0x02 (invalid address for write) Fru 0x0 Sense flags: Blk 0 (not valid) resid: 32768 cmd finished after 13.786s timeout 200s write track data: error after 25025347584 bytes cdrecord: The current problem looks like a buffer underrun. cdrecord: It looks like 'driveropts=burnfree' does not work for this drive. cdrecord: Please report. cdrecord: Make sure that you are root, enable DMA and check your HW/OS set up. 1. I ran this command without driveropts=burnfree, and got a message saying I should use that same burnfree option: cmd finished after 11.627s timeout 200s write track data: error after 25,025,347,584 bytes cdrecord: The current problem looks like a buffer underrun. cdrecord: Try to use 'driveropts=burnfree'. cdrecord: Make sure that you are root, enable DMA and check your HW/OS set up. 2. I ran the cdrecord command as root both times, yet cdrecord warned that I should be root. 3. I don't know how to enable DMA. I do have AHCI enabled in the BIOS. 4. My data source is connected to my computer via eSATA. 5. My Blu-ray writer is connected at the slower, USB-2.0 port, to avoid buffer underruns. 6. Pioneer says the Blu-ray writer is supposed to work at 12x speed, and has a 4M buffer. My laptop has 4G RAM, 0.25G free. |
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