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Posted 19 Sep 2002

Write a UDF CDR

, 22 Jul 2003
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How to write a CDR in UDF


Some electronic devices need to use CDR as storage media, and you have to append several files each time before the space is used out. In this case, UDF is a good solution, since for each writing, only 7 logic blocks of overhead are used. (Multisession CDs use several minutes for each session's leadout)


How to use the demo

(You need WNASPI32.dll to run the demo, which could be downloaded from Ahead.)

  • Select the CDR drive you want to write to.
  • Insert a blank disc, "Format" it.
  • Browse to select files, and write to the disc. (Now you can view the files using DirectCD).
  • You can list the content of the CDR, and restore files to hard disk
  • Close Session, now any CD drive can read it..


How to use the source code

//Create a variable for your drive
SCSI2 m_drive;
//m_HA:HostAdpaterNumber,m_ID:SCSI ID,m_LUN:LogicUnitNumber
//For a blank CDR, you need to format it 
//Then you can write files onto it
//Append more files here...
//After you have writen ALL the files, close the session
//Now it's readable by regular CDROM drive.


Some useful functions

SCSIRead()      //Read data from CDR
WritePacket()      //Write packets to CDR
ReadTrackInfo()      //Read track info, like next writable address
ReadDiskInfo()      //Read disc info, like capacity
TestUnitReady()      //See if the drive is ready
LoadUnload()      //Eject/Close the tray
SetWriteParameters()    //Set write mode
SCSISetSpeed()      //Set read/write speed
ListFiles()      //List files on the CDR
SaveFileAs()      //Save file on CDR to hard disk

If you want to know more inside stuff

Things you need to have:

  • SCSI command block structure (ANSI X3.131-1994)
  • SCSI multimedia commands-2 (ANSI NCITS 333-2000)
  • OSTA specs: ECMA-167, Universal Disk Format Specification, ECMA-119

Things you need to know:

  • SCSI2 block command structure
  • Use of ASPI
  • Concepts about CDR: track, session, logical blocks, PMA, ATIP, TOC, write modes...
  • UDF(Volume structure, file system)

More info at my website.

Revision History

  • Ver 1.01
    • More comments, some code clean up
    • New function: ListFiles()
    • New function: SaveFileAs()
  • Ver 1.02
    • Some changes on the demo application


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

United States United States
Wheels I reinvented on various embedded systems

*License Plate Reader
*TCP/IP stack
*Web Server
*Ethernet/SCSI/USB drivers
*FAT32/UDF file system
*JPEG/MJPEG encoder

You may also be interested in...


Comments and Discussions

GeneralNot working in Release mode Pin
Abinash Mohanty17-Aug-09 19:23
memberAbinash Mohanty17-Aug-09 19:23 
GeneralRe:DVD-RAM FAT32 format in xp Pin
rrbhuvan10-Aug-07 4:33
memberrrbhuvan10-Aug-07 4:33 
Generalno load Pin
bose_sard24-Nov-05 19:16
memberbose_sard24-Nov-05 19:16 
QuestionHow many copies make by the CDR Pin
ThangaDharma5-Oct-05 7:22
memberThangaDharma5-Oct-05 7:22 
GeneralClose Session Problem Pin
gzu5323-Aug-05 4:24
membergzu5323-Aug-05 4:24 
GeneralCode corrections Pin
nico0418-Aug-04 22:18
membernico0418-Aug-04 22:18 
QuestionHow to append files to a UDF CDR Pin
jacmod10-Aug-04 17:46
memberjacmod10-Aug-04 17:46 
AnswerClose session Error: Pin
jacmod25-Aug-04 17:52
memberjacmod25-Aug-04 17:52 
GeneralError in "Write Files" Process Pin
jacmod5-Jul-04 22:30
memberjacmod5-Jul-04 22:30 
GeneralRe: Error in "Write Files" Process Pin
Anonymous15-Jul-04 20:34
sussAnonymous15-Jul-04 20:34 
GeneralRe: Error in "Write Files" Process Pin
jacmod28-Jul-04 17:19
memberjacmod28-Jul-04 17:19 
GeneralRe: Error in "Write Files" Process Pin
Anonymous29-Jul-04 1:28
sussAnonymous29-Jul-04 1:28 
GeneralRe: Error in "Write Files" Process Pin
jacmod10-Aug-04 17:29
memberjacmod10-Aug-04 17:29 
GeneralError in SetWriteParameters() function Pin
sunil samineni24-Jun-04 0:37
membersunil samineni24-Jun-04 0:37 
GeneralRe: Error in SetWriteParameters() function Pin
fullluck1-Jul-04 21:28
memberfullluck1-Jul-04 21:28 
Generalexplain note 4 in ATAPI code fix Pin
fkking25-May-04 13:13
sussfkking25-May-04 13:13 
GeneralRe: explain note 4 in ATAPI code fix Pin
fullluck27-May-04 1:20
memberfullluck27-May-04 1:20 
GeneralRe: explain note 4 in ATAPI code fix Pin
fkking28-May-04 10:27
memberfkking28-May-04 10:27 
QuestionWhat's mean this error code? Pin
holysky10019-May-04 19:20
memberholysky10019-May-04 19:20 
AnswerRe: What's mean this error code? Pin
fkking25-May-04 13:15
sussfkking25-May-04 13:15 
GeneralDVD RAM Format Pin
Anonymous12-May-04 5:48
sussAnonymous12-May-04 5:48 
GeneralRe: DVD RAM Format Pin
nico0416-Aug-04 4:24
membernico0416-Aug-04 4:24 
GeneralRe: DVD RAM Format Pin
KenThompson10-Mar-08 3:07
memberKenThompson10-Mar-08 3:07 
GeneralCD writer is not detecting Pin
Prashant N12-Apr-04 20:39
sussPrashant N12-Apr-04 20:39 
GeneralLast block information Pin
kiran_128-Apr-04 2:47
memberkiran_128-Apr-04 2:47 
Questionhow to write a directory Pin
nicho9-Mar-04 22:00
membernicho9-Mar-04 22:00 
GeneralDisc manufacturer Pin
Anonymous13-Feb-04 12:39
sussAnonymous13-Feb-04 12:39 
Generalsample code is not for ATAPI drive, suggested fixes Pin
fkking17-Jan-04 13:23
memberfkking17-Jan-04 13:23 
GeneralWrite Error Pin
pigy30-Nov-03 21:22
memberpigy30-Nov-03 21:22 
QuestionWhat mmc command not support ATAPI? Pin
Anonymous9-Nov-03 16:26
sussAnonymous9-Nov-03 16:26 
GeneralFormat a CDR with DELPHI Pin
miximax19-Aug-03 4:14
membermiximax19-Aug-03 4:14 
GeneralSector Write in CD Pin
samesky16-Aug-03 20:59
membersamesky16-Aug-03 20:59 
Generalburning a CD-R disk using a packet-writing Pin
RPMcoffee14-Jul-03 17:10
memberRPMcoffee14-Jul-03 17:10 
GeneralRe: burning a CD-R disk using a packet-writing Pin
Hongfeng16-Jul-03 6:51
memberHongfeng16-Jul-03 6:51 
GeneralRe: burning a CD-R disk using a packet-writing Pin
RPMcoffee21-Jul-03 4:23
memberRPMcoffee21-Jul-03 4:23 
GeneralRe: burning a CD-R disk using a packet-writing Pin
Hongfeng23-Jul-03 10:21
memberHongfeng23-Jul-03 10:21 
GeneralRe: burning a CD-R disk using a packet-writing Pin
RPMcoffee23-Jul-03 17:16
memberRPMcoffee23-Jul-03 17:16 
Generalfound au dio cd burner source code Pin
Anonymous28-Mar-03 14:00
sussAnonymous28-Mar-03 14:00 
Questionwhat is your OS? (null) Pin
Anonymous6-Feb-03 20:31
sussAnonymous6-Feb-03 20:31 
Anonymous6-Feb-03 15:26
sussAnonymous6-Feb-03 15:26 
QuestionHow to read VAT ICB? Pin
Anonymous5-Feb-03 13:27
sussAnonymous5-Feb-03 13:27 
AnswerRe: How to read VAT ICB? Pin
Hongfeng6-Feb-03 4:16
memberHongfeng6-Feb-03 4:16 
GeneralRe: How to read VAT ICB? Pin
chimpanzeeVN20-Oct-03 23:55
memberchimpanzeeVN20-Oct-03 23:55 
GeneralRe: How to read VAT ICB? Pin
Anonymous21-Oct-03 16:16
sussAnonymous21-Oct-03 16:16 
QuestionWhy Can I Record CD? Pin
ryushark27-Jan-03 14:36
memberryushark27-Jan-03 14:36 
AnswerRe: Why Can I Record CD? Pin
Christian Graus27-Jan-03 14:48
memberChristian Graus27-Jan-03 14:48 
GeneralRe: Why Can I Record CD? Pin
Mike Nordell27-Jan-03 15:48
memberMike Nordell27-Jan-03 15:48 
Christian Graus wrote:

In other words, when this was first posted, it contained software which the author did not have the right to distribute, and he removed it when this was pointed out to him.

Is that a fact?

From what I read from the article, he made just one (fatal) mistake, and that was using only the ASPI API. Had he used any of the the published ASPI <-> SPTI (and make no mistake, SPTI is what is used even for ATAPI devices on NT kernel based operating systems) I believe this would have worked like a charm for almost any ATAPI CD-R/W drive.

I've got some GPL'd source to use ASPI calls with very little source code change to instead access SPTI. I'm not interested in hosting it myself, but should anyone else want it, you know how to reach me.

It works like a charm - I've used it for CDRecord/cdrtools for several years now. Hell, I've even got a full CD-buring/reading incl. MP3 encoding and decoding suite on one single floppy disk. With enough room to spare to put some MP3'd heavy metal on it! Smile | :)

I have never tried it for packet writing since I 1) never had the need, and 2) haven't bothered to look into how UDF works (which I must give a lot of credit to the author of this article, to have displayed the stamina to research it, put it in source and write an - albeit short - article about it), but I see no reason whatsoever it shouldn't work.
GeneralDemo Project File Problem -- no rc file Pin
Anonymous27-Jan-03 4:28
sussAnonymous27-Jan-03 4:28 
GeneralRe: Demo Project File Problem -- no rc file Pin
ryushark27-Jan-03 14:28
memberryushark27-Jan-03 14:28 
GeneralATAPI Pin
Codegg12349-Dec-02 8:19
memberCodegg12349-Dec-02 8:19 

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