Conclusion
If you could, write as much closer to disk capable size as possible,
for your need over 22M of multi-session overhead to be able to write
next bit on CD. Ie, if you leave 20M open on CD, it will be totally
wasted.
Summary
-
The '# of sectors used' / 512 = the 'M space it takes'
Also true for 'Blocks total' and 'Blocks remains'
-
size reported by du is bigger on HD than on CD
E.g.: HD 735468544, CD: 732443136
cdrecord -multi recording
-
CD sector size = 2048
-
(mkfs extents written) ~= (file size)
-
(mkfs extents written) = (Track <new>: data)
-
(Total bytes read/written) = (Total size) - 2 sectors (4k)
-
(Blocks total) - (Total size) = (Blocks remaining)
cdrecord -msinfo
-
will return last_sess_start,next_sess_start, i.e., the start sector of the
last session and the begining of this session.
(track:lout) - (this session begin sector) = (multi-session overhead)
-
multi-session overhead (for 700M disk) is 11400 sectors (22.3M)
(cdrecord -msinfo, 2nd val) - (track:lout)
cdrecord -toc
-
1st number/column is the start sector of data session
-
2nd number/column (in ()) is 4 times the 1st column
-
(this session begin sector) + (Total size) = (next session begin sector)
-
The last (next session begin sector) is listed in 'track:lout'
-
multi-session overhead is 11400 sectors (22.3M)
$ cdrecord -multi dev=0,0,0 -eject -v speed=8 $ISOF
Track 01: data 10 MB
Total size: 11 MB (01:08.42) = 5132 sectors
Lout start: 11 MB (01:10/32) = 5132 sectors
Current Secsize: 2048
ATIP start of lead in: -11940 (97:22/60)
ATIP start of lead out: 335975 (74:41/50)
speed low: 0 speed high: 4
Blocks total: 335975 Blocks current: 194721 Blocks remaining: 189589
Starting to write CD/DVD at speed 4 in write mode for multi session.
Starting new track at sector: 141254
Track 06: 10 of 10 MB written (fifo 100%).
Track 06: Total bytes read/written: 10506240/10506240 (5130 sectors).
ATIP start of lead out = 335975 = Blocks total.
Blocks current = 194721 = 335975-141254 (Blocks total - last_sess_start)
Blocks remaining = 189589 = 335975-146386 (Blocks total - next_sess_start)
excluding session overhead
Example
MvB040413.4
357728 extents written (698 Mb)
'du -m $ISOF' = 702
Track 01: data 698 MB
Total size: 802 MB (79:29.73) = 357730 sectors
Lout start: 802 MB (79:31/55) = 357730 sectors
— 802 - 698 = 104
Blocks total: 359849 Blocks current: 359849 Blocks remaining: 2119
Track 01: 698 of 698 MB written (fifo 100%) [buf 99%] 12.2x.
Track 01: Total bytes read/written: 732626944/732626944 (357728 sectors).
% cdrecord -msinfo
cdrecord: Drive needs to reload the media to return to proper status.
cdrecord: Input/output error. read track info: scsi sendcmd: no error
[...]
cdrecord: Cannot read first writable address
% cdrecord -toc
track: 1 lba: 0 ( 0) 00:02:00 adr: 1 control: 4 mode: 2
track:lout lba: 357730 ( 1430920) 79:31:55 adr: 1 control: 4 mode: -1
— 357730 * 4 = 1430920
MvB040413.5
286880 extents written (560 Mb)
— 286882/ 512 = 560.316, 286880 / 512 = 560.312
Track 01: data 560 MB
Total size: 643 MB (63:45.09) = 286882 sectors
Lout start: 643 MB (63:47/07) = 286882 sectors
— 643 - 560 = 83
Blocks total: 359849 Blocks current: 359849 Blocks remaining: 72967
— 359849 / 512 = 702.83,
— 72967 / 512 = 142.514, 142.514 + 560.312 = 702.826
Track 01: 560 of 560 MB written (fifo 100%) [buf 99%] 12.4x.
Track 01: Total bytes read/written: 587530240/587530240 (286880 sectors).
— 587530240 / 1024 / 1024 = 560.312
— 587530240 Bytes / 286880 Sectors = 2048 B/S
$ cdrecord -msinfo
0,298282
— 298282 - 286882 = 11400
$ cdrecord -toc
track: 1 lba: 0 ( 0) 00:02:00 adr: 1 control: 4 mode: 2
track:lout lba: 286882 ( 1147528) 63:47:07 adr: 1 control: 4 mode: -1
— 286882 * 4 = 1147528
MvB040426.1, right after the MvB040413.5
$ mkisofs -r -N -L -d -D -J -f -C `cdrecord -msinfo` -M $CDR_DEVICE -o $ISOF MvB$cdate.$cdisk.dar
83.63% done, estimate finish Wed Apr 28 15:41:51 2004
85.02% done, estimate finish Wed Apr 28 15:41:51 2004
[...]
98.95% done, estimate finish Wed Apr 28 15:41:54 2004
358752 extents written (700 Mb)
% cdrecord -multi -eject -v speed=$CDR_SPEED $ISOF
[...]
Track 01: data 118 MB
Total size: 135 MB (13:26.29) = 60472 sectors
Lout start: 135 MB (13:28/22) = 60472 sectors
Current Secsize: 2048
[...]
Blocks total: 359849 Blocks current: 61567 Blocks remaining: 1095
Forcespeed is OFF.
[...]
Starting to write CD/DVD at speed 12 in real TAO mode for multi session.
BURN-Free is ON.
Turning BURN-Free off
Performing OPC...
Starting new track at sector: 298282
Track 02: 118 of 118 MB written (fifo 100%) [buf 99%] 12.5x.
Track 02: Total bytes read/written: 123842560/123842560 (60470 sectors).
|
!! |
560 + 118 = 678
700 - 678 = 22
----- MvB040426.6
$ mkisofs -r -N -L -d -D -J -f -o $ISOF MvB$cdate.$cdisk.dar*
mkisofs: Warning: -follow-links does not always work correctly; be careful.
Warning: creating filesystem that does not conform to ISO-9660.
12.64% done, estimate finish Wed Apr 28 17:58:15 2004
[...]
88.37% done, estimate finish Wed Apr 28 17:58:16 2004
Total translation table size: 0
Total rockridge attributes bytes: 256
Total directory bytes: 0
Path table size(bytes): 10
Max brk space used 6444
39616 extents written (77 Mb)
'du -m $ISOF' = 78
% cdrecord -multi -eject -v speed=$CDR_SPEED $ISOF
Track 01: data 77 MB
Total size: 88 MB (08:48.24) = 39618 sectors
Lout start: 89 MB (08:50/18) = 39618 sectors
Blocks total: 359849 Blocks current: 359849 Blocks remaining: 320231
Track 01: 77 of 77 MB written (fifo 100%) [buf 99%] 12.6x.
Track 01: Total bytes read/written: 81133568/81133568 (39616 sectors).
$ cdrecord -msinfo
0,51018
$ cdrecord -toc
first: 1 last 1
track: 1 lba: 0 ( 0) 00:02:00 adr: 1 control: 4 mode: 2
track:lout lba: 39618 ( 158472) 08:50:18 adr: 1 control: 4 mode: -1
MvB040428.1, right after the MvB040426.6
(320231 - 11400) / 512 = 603.186
dar -s 700M -S600M -b -R . -X "*~" -D -c $cdir/MvB$cdate
358272 extents written (699 Mb)
Blocks total: 359849 Blocks current: 308831 Blocks remaining: 1575
Starting new track at sector: 51018
Track 02: 600 of 600 MB written (fifo 100%) [buf 99%] 12.6x.
Track 02: Total bytes read/written: 629256192/629256192 (307254 sectors).
Case 1
session 1
TRACK=`cdrecord -msinfo dev=$CDRW`
$ cdrecord dev=/dev/sg0 -toc
Cdrecord 1.10 (i686-pc-linux-gnu) Copyright (C) 1995-2001 Jorg Schilling
scsidev: '/dev/sg0'
devname: '/dev/sg0'
scsibus: -2 target: -2 lun: -2
Linux sg driver version: 3.1.24
Using libscg version 'schily-0.5'
Device type : Removable CD-ROM
Version : 0
Response Format: 2
Capabilities :
Vendor_info : 'SONY '
Identifikation : 'CD-RW CRX175A1 '
Revision : '5YS2'
Device seems to be: Generic mmc CD-RW.
Using generic SCSI-3/mmc CD-R driver (mmc_cdr).
Driver flags : SWABAUDIO
first: 1 last 5
track: 1 lba: 0 ( 0) 00:02:00 adr: 1 control: 4 mode: 2
track: 2 lba: 13002 ( 52008) 02:55:27 adr: 1 control: 4 mode: 2
track: 3 lba: 57094 ( 228376) 12:43:19 adr: 1 control: 4 mode: 2
track: 4 lba: 92838 ( 371352) 20:39:63 adr: 1 control: 4 mode: 2
track: 5 lba: 129142 ( 516568) 28:43:67 adr: 1 control: 4 mode: 2
track:lout lba: 134354 ( 537416) 29:53:29 adr: 1 control: 4 mode: -1
$ cdrecord -msinfo dev=/dev/sg0
129142,141254
— 141254 - 134354 = 6900
This 6900 is the overhead for CD multi-session. To be precise, it is the
overhead for CD-RW multi-session, CD is 11400.
$ mkisofs -r -N -L -d -D -J -f -o $ISOF -graft-points briefcase$TODAY/=.
Warning: creating filesystem that does not conform to ISO-9660.
99.54% done, estimate finish Sat Dec 28 00:56:33 2002
Total translation table size: 0
Total rockridge attributes bytes: 1307
Total directory bytes: 2048
Path table size(bytes): 26
Max brk space used 7544
5024 extents written (9 Mb)
$ mkisofs -v -v -r -J -f -o $ISOF -C $TRACK -M /dev/scd0 .
mkisofs 1.14 (i686-pc-linux-gnu)
Rock Ridge signatures found
Scanning .
141282 3924
141284 566 /histories
141285 668 /histories/applications
[...]
Cache hit for /zips/.
Cache hit for /zips/..
Total extents scheduled to be written = 5114
99.07% done, estimate finish Sat Dec 28 01:03:58 2002
Total translation table size: 0
Total rockridge attributes bytes: 24332
Total directory bytes: 102400
Path table size(bytes): 664
Max brk space used 20000
146368 extents written (285 Mb)
$ cdrecord -multi dev=0,0,0 -eject -v speed=8 $ISOF
Cdrecord 1.10 (i686-pc-linux-gnu) Copyright (C) 1995-2001 Jorg Schilling
TOC Type: 3 = CD-ROM XA mode 2
scsidev: '0,0,0'
scsibus: 0 target: 0 lun: 0
Track 01: data 10 MB
Total size: 11 MB (01:08.42) = 5132 sectors
Lout start: 11 MB (01:10/32) = 5132 sectors
Current Secsize: 2048
ATIP start of lead in: -11940 (97:22/60)
ATIP start of lead out: 335975 (74:41/50)
speed low: 0 speed high: 4
Blocks total: 335975 Blocks current: 194721 Blocks remaining: 189589
Starting to write CD/DVD at speed 4 in write mode for multi session.
Starting new track at sector: 141254
Track 06: 10 of 10 MB written (fifo 100%).
Track 06: Total bytes read/written: 10506240/10506240 (5130 sectors).
ATIP start of lead out = 335975 = Blocks total.
Blocks current = 194721 = 335975-141254 (Blocks total - last_sess_start)
Blocks remaining = 189589 = 335975-146386 (Blocks total - next_sess_start)
$ cdrecord dev=/dev/sg0 -toc
track: 1 lba: 0 ( 0) 00:02:00 adr: 1 control: 4 mode: 2
track: 2 lba: 13002 ( 52008) 02:55:27 adr: 1 control: 4 mode: 2
track: 3 lba: 57094 ( 228376) 12:43:19 adr: 1 control: 4 mode: 2
track: 4 lba: 92838 ( 371352) 20:39:63 adr: 1 control: 4 mode: 2
track: 5 lba: 129142 ( 516568) 28:43:67 adr: 1 control: 4 mode: 2
track: 6 lba: 141254 ( 565016) 31:25:29 adr: 1 control: 4 mode: 2
track:lout lba: 146386 ( 585544) 32:33:61 adr: 1 control: 4 mode: -1
"Track 06: … 10 MB written … Total bytes read/written: 10506240/10506240 (5130 sectors)"
— 5130 * 2048 = 10506240
— 146386 - 141254 = 5132
141254 & 146386 are the session begining & end.
$ cdrecord -msinfo dev=/dev/sg0
141254,153286
— 153286 - 146386 = 6900
Again, the multi-session overhead is 6900.
session 2
% mkisofs -r -N -L -d -D -J -f -o $ISOF -graft-points briefcase$TODAY/=.
Warning: creating filesystem that does not conform to ISO-9660.
Total translation table size: 0
Total rockridge attributes bytes: 659
Total directory bytes: 2048
Path table size(bytes): 26
Max brk space used 7544
3248 extents written (6 Mb)
% mkisofs -v -v -r -J -f -o $ISOF -C $TRACK -M /dev/scd0 .
Total extents scheduled to be written = 3354
Total translation table size: 0
Total rockridge attributes bytes: 23674
Total directory bytes: 102400
Path table size(bytes): 664
Max brk space used 1f000
144608 extents written (282 Mb)
% cdrecord -multi dev=0,0,0 -eject -v speed=8 $ISOF
Track 01: data 6 MB
Total size: 7 MB (00:44.74) = 3356 sectors
Lout start: 7 MB (00:46/56) = 3356 sectors
Blocks total: 335975 Blocks current: 182689 Blocks remaining: 179333
Track 07: 6 of 6 MB written (fifo 100%).
Track 07: Total bytes read/written: 6868992/6868992 (3354 sectors).
track: 1 lba: 0 ( 0) 00:02:00 adr: 1 control: 4 mode: 2
track: 2 lba: 13002 ( 52008) 02:55:27 adr: 1 control: 4 mode: 2
track: 3 lba: 57094 ( 228376) 12:43:19 adr: 1 control: 4 mode: 2
track: 4 lba: 92838 ( 371352) 20:39:63 adr: 1 control: 4 mode: 2
track: 5 lba: 129142 ( 516568) 28:43:67 adr: 1 control: 4 mode: 2
track: 6 lba: 141254 ( 565016) 31:25:29 adr: 1 control: 4 mode: 2
track: 7 lba: 153286 ( 613144) 34:05:61 adr: 1 control: 4 mode: 2
track:lout lba: 156642 ( 626568) 34:50:42 adr: 1 control: 4 mode: -1
-- 3354 * 2048 = 6868992
-- 156642 - 153286 = 3356
$ cdrecord -msinfo dev=/dev/sg0
153286,163542
-- 163542 - 156642 = 6900
session 3
$ mkisofs -r -N -L -d -D -J -f -o $ISOF -C $TRACK -M /dev/scd0 -graft-points briefcase$TODAY/=.
Warning: creating filesystem that does not conform to ISO-9660.
Rock Ridge signatures found
Using BRIEF000 for /briefcase (briefcase2002-12-28)
98.86% done, estimate finish Sat Dec 28 01:34:58 2002
Total translation table size: 0
Total rockridge attributes bytes: 25213
Total directory bytes: 106496
Path table size(bytes): 696
Max brk space used 20000
166912 extents written (326 Mb)
% cdrecord -multi dev=0,0,0 -eject -v speed=8 $ISOF
Track 01: data 6 MB
Total size: 7 MB (00:44.96) = 3372 sectors
Lout start: 7 MB (00:46/72) = 3372 sectors
Blocks total: 335975 Blocks current: 172433 Blocks remaining: 169061
Summary
Final Status
track: 1 lba: 0 ( 0) 00:02:00 adr: 1 control: 4 mode: 2
track: 2 lba: 11702 ( 46808) 02:38:02 adr: 1 control: 4 mode: 2
track: 3 lba: 20054 ( 80216) 04:29:29 adr: 1 control: 4 mode: 2
track:lout lba: 20356 ( 81424) 04:33:31 adr: 1 control: 4 mode: -1
First write
Track 01: data 0 MB padsize: 504 KB
Total size: 0 MB (00:04.02) = 302 sectors
Lout start: 1 MB (00:06/02) = 302 sectors
Second write
$ cdrecord -msinfo dev=/dev/sg0
MULTI_INFO=0,11702
Track 02: Total bytes read/written: 2969600/2969600 (1450 sectors).
— 11702 + 1450 = 13152
Third write
$ cdrecord -msinfo dev=/dev/sg0
MULTI_INFO=11702,20054
Starting new track at sector: 20054
Track 03: 0 of 0 MB written.
Track 03: writing 228 KB of pad data.
Track 03: Total bytes read/written: 380928/614400 (300 sectors).
— 20054 + 300 +2 = 20356
First write
work log
Getting disc info
$ cdrecord -msinfo dev=/dev/sg0
MULTI_INFO=0,11702
+ mkisofs -R -T -f -o /tmp/backup.img /tmp/backupshadow
Total translation table size: 46
Total rockridge attributes bytes: 326
Total directory bytes: 0
Path table size(bytes): 10
Max brk space used 4544
48 extents written (0 Mb)
+ cdrecord dev=/dev/sg0 -multi -eject -v speed=4 /tmp/backup.img
Cdrecord 1.10 (i686-pc-linux-gnu) Copyright (C) 1995-2001 Jorg Schilling
TOC Type: 3 = CD-ROM XA mode 2
cdrecord: Operation not permitted. WARNING: Cannot do mlockall(2).
cdrecord: WARNING: This causes a high risk for buffer underruns.
cdrecord: Operation not permitted. WARNING: Cannot set RR-scheduler
cdrecord: Permission denied. WARNING: Cannot set priority using setpriority().
cdrecord: WARNING: This causes a high risk for buffer underruns.
scsidev: '/dev/sg0'
devname: '/dev/sg0'
scsibus: -2 target: -2 lun: -2
Linux sg driver version: 3.1.24
Using libscg version 'schily-0.5'
atapi: 1
Device type : Removable CD-ROM
Version : 0
Response Format: 2
Capabilities :
Vendor_info : 'SONY '
Identifikation : 'CD-RW CRX175A1 '
Revision : '5YS2'
Device seems to be: Generic mmc CD-RW.
Using generic SCSI-3/mmc CD-R driver (mmc_cdr).
Driver flags : SWABAUDIO
Drive buf size : 1966272 = 1920 KB
FIFO size : 4194304 = 4096 KB
Track 01: data 0 MB padsize: 504 KB
Total size: 0 MB (00:04.02) = 302 sectors
Lout start: 1 MB (00:06/02) = 302 sectors
Current Secsize: 2048
ATIP info from disk:
Indicated writing power: 5
Reference speed: 2
Is not unrestricted
Is erasable
ATIP start of lead in: -11940 (97:22/60)
ATIP start of lead out: 335975 (74:41/50)
speed low: 0 speed high: 4
power mult factor: 3 5
recommended erase/write power: 2
A2 values: 5A A6 14
Disk type: Phase change
Manuf. index: 43
Manufacturer: Acer Media Technology, Inc.
Blocks total: 335975 Blocks current: 335975 Blocks remaining: 335673
cdrecord: Operation not permitted. WARNING: Cannot set RR-scheduler
cdrecord: Permission denied. WARNING: Cannot set priority using setpriority().
cdrecord: WARNING: This causes a high risk for buffer underruns.
Starting to write CD/DVD at speed 4 in write mode for multi session.
Last chance to quit, starting real write in 0 seconds. Operation starts.
Waiting for reader process to fill input buffer ... input buffer ready.
Performing OPC...
Starting new track at sector: 0
Track 01: 0 of 0 MB written.
Track 01: writing 504 KB of pad data.
Track 01: Total bytes read/written: 98304/614400 (300 sectors).
Writing time: 13.534s
Fixating...
Fixating time: 79.694s
cdrecord: fifo had 2 puts and 2 gets.
cdrecord: fifo was 0 times empty and 0 times full, min fill was 100%.
Result
Only two files written to the cd, TRANS.TBL & DATE.
Second write
work log
Getting disc info
$ cdrecord -msinfo dev=/dev/sg0
MULTI_INFO=0,11702
+ mkisofs -R -T -f -o /tmp/backup.img -C 0,11702 -M /dev/scd0 /tmp/backupshadow
Rock Ridge signatures found
Total translation table size: 598
Total rockridge attributes bytes: 1208
Total directory bytes: 0
Path table size(bytes): 10
Max brk space used 4000
13152 extents written (25 Mb)
Performing OPC...
Starting new track at sector: 11702
Track 02: 2 of 2 MB written (fifo 100%).
Track 02: Total bytes read/written: 2969600/2969600 (1450 sectors).
Writing time: 9.640s
Fixating...
Fixating time: 40.618s
cdrecord: fifo had 47 puts and 47 gets.
cdrecord: fifo was 0 times empty and 0 times full, min fill was 100%.
Result
the whole /export/baks directory get written it. But the file case and name
is odd, because of the format it chose.
11702 (new track starting sector) - 302 (last session total sectors) = 11400
Third write
work log
Getting disc info
$ cdrecord -msinfo dev=/dev/sg0
MULTI_INFO=11702,20054
+ mkisofs -r -N -L -d -D -J -f -o /tmp/backup.img -C 11702,20054 -M /dev/scd0 /tmp/backupshadow
Warning: creating filesystem that does not conform to ISO-9660.
Rock Ridge signatures found
Using KS8000.CFG for /tmp/backupshadow/ks/ks8.cfg,v (ks8.cfg)
Total translation table size: 0
Total rockridge attributes bytes: 4478
Total directory bytes: 6144
Path table size(bytes): 20
Max brk space used a000
20240 extents written (39 Mb)
Performing OPC...
Starting new track at sector: 20054
Track 03: 0 of 0 MB written.
Track 03: writing 228 KB of pad data.
Track 03: Total bytes read/written: 380928/614400 (300 sectors).
Writing time: 5.706s
Fixating...
Fixating time: 40.638s
cdrecord: fifo had 6 puts and 6 gets.
cdrecord: fifo was 0 times empty and 0 times full, min fill was 100%.
Result
The ks directory under /export/baks is appended. The file names show correctly
this time, including long file names.
Check the result and space.
# cdrecord -msinfo dev=/dev/sg0
20054,27256
# cdrecord dev=/dev/sg0 -toc
Cdrecord 1.10 (i686-pc-linux-gnu) Copyright (C) 1995-2001 Jorg Schilling
scsidev: '/dev/sg0'
devname: '/dev/sg0'
scsibus: -2 target: -2 lun: -2
Linux sg driver version: 3.1.24
Using libscg version 'schily-0.5'
Device type : Removable CD-ROM
Version : 0
Response Format: 2
Capabilities :
Vendor_info : 'SONY '
Identifikation : 'CD-RW CRX175A1 '
Revision : '5YS2'
Device seems to be: Generic mmc CD-RW.
Using generic SCSI-3/mmc CD-R driver (mmc_cdr).
Driver flags : SWABAUDIO
first: 1 last 3
track: 1 lba: 0 ( 0) 00:02:00 adr: 1 control: 4 mode: 2
track: 2 lba: 11702 ( 46808) 02:38:02 adr: 1 control: 4 mode: 2
track: 3 lba: 20054 ( 80216) 04:29:29 adr: 1 control: 4 mode: 2
track:lout lba: 20356 ( 81424) 04:33:31 adr: 1 control: 4 mode: -1
$ du -k
254 ./ks
3066 .
Conclusion
