Difference between 'SAO' and 'DAO'

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Difference between 'SAO' and 'DAO'

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gsmackfan

Junior Member

8. June 2006 @ 07:25

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Hello All.

I was just wondering if anyone knew what the difference was between the SAO and DAO write types in either Imgburn or DVD Decrypter? I did some searching, but couldn't find anything. I even searched the Imgburn website, but thought I'd ask here... since there are quite a few experts here that have helped out before.

I ask because I've finally been able to burn Dual-Layer DVDs using the ISO rip w/ Decypter, ISO burn, booktype to DVD-ROM, write speed 2.4x... and so on. I was getting all kinds of problems from lead-in errors, to write address failures, to sector errors and it seems that the latest FW for my external Sony 810UL (2.0e) has fixed the problem. However, when I tried the latest version of Imgburn (1.3.0.0) the other night, and got a 'operation completed successfully', I was unable to play the back-up in my standalone players. They both said 'cannot play disc'.

So, getting to the point here... I thought I'd try the exact same thing, but with DVD Decypter 3.5.4.0 (ISO write, etc.) and ALL is fine! The discs play great with no problems. This is where my question comes in... from looking at the logs (see below), the only thing different (that I can see), is the write type for the failed disc was set to 'DAO' (in Imgburn) and the ones that work fine the write type was 'SAO' (in DVD Decrypter). I didn't change anything after loading the new version of Imgburn either.

FAILED BURN

I 20:34:59 ImgBurn Version 1.3.0.0 started!
I 20:34:59 Microsoft Windows XP Home Edition (5.1, Build 2600 : Service Pack 2)
I 20:34:59 Initialising SPTI...
I 20:34:59 Searching for SCSI / ATAPI devices...
I 20:34:59 Found 1 DVD-ROM/CD-RW and 1 DVD±RW!
I 20:44:18 Operation Started!
I 20:44:18 Source File: F:\DW_DISC_3.MDS
I 20:44:18 Source File Sectors: 3,926,317 (MODE1/2048)
I 20:44:18 Source File Size: 8,041,097,216 bytes
I 20:44:18 Source File Volume Identifier: DW_DISC_3
I 20:44:18 Source File Implementation Identifier: Spruce Technologies
I 20:44:18 Source File UDF Revision: 1.02
I 20:44:18 Destination Device: [0:0:0] SONY DVD RW DRU-810A 2.0e (H:) (USB)
I 20:44:18 Destination Media Type: DVD+R DL (Disc ID: MKM-001-00) (Speeds: 2.4x, 4x, 8x)
I 20:44:18 Destination Media Sectors: 4,173,824
I 20:44:18 Write Mode: DVD
I 20:44:18 Write Type: DAO
I 20:44:18 Write Speed: 2.4x
I 20:44:18 Link Size: Auto
I 20:44:18 Test Mode: No
I 20:44:18 BURN-Proof: Enabled
I 20:44:18 Optimal L0 Data Zone Capacity: 2,063,088
I 20:44:18 Optimal L0 Data Zone Method: Copied From Original Disc
I 20:44:18 Filling Buffer...
I 20:44:20 Writing LeadIn...
I 20:44:23 Writing Image...
I 20:44:23 Writing Layer 0... (LBA: 0 - 2063087)
I 21:05:34 Writing Layer 1... (LBA: 2063088 - 3926316)
I 21:24:40 Synchronising Cache...
I 21:24:41 Closing Track...
I 21:24:42 Finalising Disc...
I 21:28:12 Operation Successfully Completed! - Duration: 00:43:53
I 21:28:12 Average Write Rate: 3,250 KB/s (2.3x) - Maximum Write Rate: 3,369 KB/s (2.4x)

PASSED BURN

I 15:44:52 DVD Decrypter Version 3.5.4.0 started!
I 15:44:52 Microsoft Windows XP Home Edition (5.1, Build 2600 : Service Pack 2)
I 15:44:52 Initialising SPTI...
I 15:44:52 Searching for SCSI / ATAPI devices...
I 15:44:52 Found 1 DVD-ROM/CD-RW and 1 DVD±RW!
I 15:47:47 Operation Started!
I 15:47:47 Source File: F:\DW_DISC_2.MDS
I 15:47:47 Source File Sectors: 4,059,184 (MODE1/2048)
I 15:47:47 Source File Size: 8,313,208,832 bytes
I 15:47:47 Source File Implementation Identifier: DVDAfterEdit
I 15:47:47 Destination Device: [0:0:0] SONY DVD RW DRU-810A 2.0e (H:) (USB)
I 15:47:47 Destination Media Type: DVD+R DL (Disc ID: MKM-001-00) (Speeds: 2.4x, 4x, 8x)
I 15:47:47 Destination Media Sectors: 4,173,824
I 15:47:47 Write Mode: DVD
I 15:47:47 Write Type: SAO
I 15:47:47 Write Speed: 2.4x
I 15:47:47 Link Size: Auto
I 15:47:47 Test Mode: No
I 15:47:47 BURN-Proof: Enabled
I 15:47:47 Optimal L0 Data Zone Capacity: 2,031,312
I 15:47:47 Optimal L0 Data Zone Method: Copied From Original Disc
I 15:47:47 Filling Buffer...
I 15:47:49 Writing LeadIn...
I 15:48:05 Writing Image...
I 16:31:11 Synchronising Cache...
I 16:31:12 Closing Track...
I 16:31:37 Finalising Disc...
I 16:33:19 Operation Successfully Completed! - Duration: 00:45:31
I 16:33:19 Average Write Rate: 3,139 KB/s (2.3x) - Maximum Write Rate: 3,360 KB/s (2.4x)

SONY DVD RW DRU-810A 2.0e (USB)
Current Profile: DVD+R DL

Disc Information:
Status: Complete
Erasable: No
Sessions: 1
Sectors: 4,062,624
Size: 8,320,253,952 bytes
Time: 902:50:24 (MM:SS:FF)
Supported Write Speeds: 2.4x, 4x, 8x

DVD+R DL Boundary Information:
L0 Data Zone Capacity: 2,031,312
Changeable: No

Physical Format Information (ADIP):
Disc ID: MKM-001-00
Book Type: DVD+R DL
Part Version: 1
Disc Size: 120mm
Maximum Read Rate: Not Specified
Number of Layers: 2
Track Path: Opposite Track Path (OTP)
Linear Density: 0.293 um/bit
Track Density: 0.74 um/track
First Physical Sector of Data Area: 196,608
Last Physical Sector of Data Area: 16,580,607
Last Physical Sector in Layer 0: 2,283,519

Physical Format Information (Last Recorded):
Disc ID: MKM-001-00
Book Type: DVD-ROM
Part Version: 1
Disc Size: 120mm
Maximum Read Rate: Not Specified
Number of Layers: 2
Track Path: Opposite Track Path (OTP)
Linear Density: 0.293 um/bit
Track Density: 0.74 um/track
First Physical Sector of Data Area: 196,608
Last Physical Sector of Data Area: 16,577,167
Last Physical Sector in Layer 0: 2,227,919

Layer Information:
Layer 0 Sectors: 2,031,312 (50%)
Layer 1 Sectors: 2,031,312 (50%)

Another thing that was odd, was Physical Format Info. after the 'failed' burn completed in Imgburn. It said there was only 1 layer burned, and used PTP (parallel track path). I would think this had something to do with the disc not playing in the standalone...

SONY DVD RW DRU-810A 2.0e (USB)
Current Profile: DVD+R DL

Disc Information:
Status: Complete
Erasable: No
Sessions: 1
Sectors: 4,062,624
Size: 8,320,253,952 bytes
Time: 902:50:24 (MM:SS:FF)
Supported Write Speeds: 2.4x, 4x, 8x

DVD±R DL Boundary Information:
L0 Data Zone Capacity: 2,031,312
Changeable: No

Physical Format Information (ADIP):
Disc ID: MKM-001-00
Book Type: DVD+R DL
Part Version: 1
Disc Size: 120mm
Maximum Read Rate: Not Specified
Number of Layers: 2
Track Path: Opposite Track Path (OTP)
Linear Density: 0.293 um/bit
Track Density: 0.74 um/track
First Physical Sector of Data Area: 196,608
Last Physical Sector of Data Area: 16,580,607
Last Physical Sector in Layer 0: 2,283,519

Physical Format Information (Last Recorded):
Book Type: DVD-ROM
Part Version: 0
Disc Size: 120mm
Maximum Read Rate: 2.52Mbps
Number of Layers: 1
Track Path: Parallel Track Path (PTP)
Linear Density: 0.267 um/bit
Track Density: 0.74 um/track
First Physical Sector of Data Area: 0
Last Physical Sector of Data Area: 0
Last Physical Sector in Layer 0: 2,031,311

I guess it doesn't really matter, but if I were to change the write type in Imgburn to 'SAO', my back-ups should then be ok... correct??? I'll probably try it anyways, just for my own mental well-being. :)

If anyone has any info. regarding this setting in Imgburn or Decrypter, please feel free to comment. Thanks!

Gregg

[ + quote]

Gregg

waynekusa

Member

8. June 2006 @ 08:01

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Here's what I found:

DAO - Disk at Once

Disc At Once recording for DVD-R media is a mode in which all data is written sequentially to the disc in one uninterrupted recording session. The on-disk contents result in a lead-in area, followed by the data, and closed by a lead-out area. The data is addressable in sectors of 2048 bytes each, with the first sector address being zero. There are no run-out blocks as in CD-R disc-at-once.

Retrieved from "http://en.wikipedia.org/wiki/Optical_disc_recording_modes"

SAO - Session at Once

Session at once is a relatively new capability used on some CD Extra discs. With SAO, an audio session is written without intertrack gaps, just as though it were DAO. The difference is that only the session is closed, so one or more additional sessions can be written. Since an audio player can only see the first session of a disc, it makes no sense to write audio after SAO (unless you want to play the disc only on your computer).

Retrieved from "http://www.mrichter.com/cdr/primer/dao.htm"

Hope that helps!

[ + quote]

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gsmackfan

Junior Member

8. June 2006 @ 08:49

Link to this message

Very interesting. Didn't even think of 'disc at once' and 'session at once'... thanks Waynekusa.

Anyone have any info. relating to Imgburn and DVD Decypter? Anyone else experiment with changing this in the 'settings' tab?

Gregg

[ + quote]

Gregg

arniebear

AfterDawn Addict

8. June 2006 @ 16:20

Link to this message

From the mouth of LUK!! himself

Quote:
Re: Decrypter .ISO File To Imgburn DVD-R DL

--------------------------------------------------------------------------------

SAO and DAO are the same thing really. I just changed the name between DVD Decrypter and ImgBurn because DAO fits in with what the MMC specs say.

The SAO name is more for CD's than DVD's.

http://club.cdfreaks.com/showthread.php?t=179135

[ + quote]

teflonmyk

Senior Member

8. June 2006 @ 17:05

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Great post arniebear!!! I was beginning to speculate myself... That really clears this issue up!

[ + quote]

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arniebear

AfterDawn Addict

8. June 2006 @ 17:47

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@teflonmyk

Thanks, lol, it was one of those questions that would nag at you until you found the answer :)

[ + quote]

gsmackfan

Junior Member

9. June 2006 @ 04:04

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Thanks for the info. dudes.

I didn't have a chance to try burning a +R DL with Imgburn (write type set to 'SAO'), but do you guys think that's what my problem was??? That was the only thing that I noticed was different in the 2 logs that I posted. Just looking to verify that...

I did, however, burn another ISO using Decrypter (using SAO) and I'm happy to say that I am now 3 for 3! I only went through about 8 or 10 DLs over the past 2 or 3 months trying to get this to work, but oh well... live and learn.

Hey, at least an explanation was given as to what DAO and SAO were... thanks again!

Have a good one,

Gregg

[ + quote]

Gregg

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