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#21
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On Wed, 21 Apr 2004 11:51:15 +0100, Alex Nichol
wrote: K2 wrote: For a few weeks I thought the same thing; multisessions seemed to work fine. Then I noticed recent files were getting corrupted, even though the burning seemed to go fine and they appeared intact from their size and names. I'd give it more time if I were you. Be sure you actually try to launch the files you've copied. If you are using a UDF file system in Nero, you are *not* I think using a packet written format, as in InCD (which then implements a UDF file system on that). The terms are often confused but are not interchangeable. So were you doing this in Nero itself - or in InCD This is within the Nero app itself, not InCD. Per the sparse Nero Help menu (below) it looks like UDF or UDF/ISO is probably not true packet writing. It seems mainly optimized for DVDs. "The UDF file system was designed at the time, when it became clear, that the ISO9660 file system does not fit the requirements of CDRWs and DVDs. It's optimized to handle huge data sizes and to minimize the necessary changes if a file needs to be added or deleted." "Nero 4 supports burning of UDF and UDF Bridge CDs that contain a UDF and an ISO9660 file system. Windows 98, and Windows 2000 can write the UDF file system without any special driver. Windows 98 and Windows 2000 will read the UDF file system, if both UDF and ISO file systems are found on the media. Burning in UDF file format will be especially useful in the future, if DVDs are to be written, because UDF is the best file system to be written onto a DVD. Please note, that currently Nero does not support UDF or Bridge multisession burning so you need to burn UDF and Bridge CDs onto empty CDRs." K2 |
#22
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On Wed, 21 Apr 2004 09:25:51 +0200, Pierre Duhem
wrote: On Wed, 21 Apr 2004 01:49:25 GMT, K2 wrote: As someone else suggested, I've tried regular ISO CD-Rs (instead of UDF/ISO) with multisessions and have had no problems so far. I'm wondering if there's a limit to the number of sessions you can do per disc? 99, according to some colored book (I don't remember which one). If so, it's not going to work too well for certain backup applications, like a single file at a time. I've also read that space is wasted each time you close a session. One 1997 Usenet post claims 13MB is wasted each time but that seems excessive. That was an older technology limit, I hope (http://makeashorterlink.com/?D2C051818) K2 |
#23
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On Wed, 21 Apr 2004 11:51:15 +0100, Alex Nichol
wrote: If you are using a UDF file system in Nero, you are *not* I think using a packet written format, as in InCD (which then implements a UDF file system on that). The terms are often confused but are not interchangeable. So were you doing this in Nero itself - or in InCD I've always had UDF associated with packet writing because the term comes up often in that context. http://downloads-zdnet.com.com/3000-2100-9497911.html "Adaptec's UDF Reader enables MultiRead CD-ROM drives to read UDF-formatted CD-R and CD-RW discs (such as those written with DirectCD)" And there does indeed seem to be a relation: http://www.informationheadquarters.com/DVD/UDF.shtml "UDF means "Universal Disk Format. The UDF format is used for so called "packet written" writable CD-ROMs that are not simply copies of ISO 9660 CDROMs. Packet writing allows CDs to be partially written using variable or fixed length records in multiple sessions." K2 |
#24
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Answering most of my own questions below, it looks like multisession
archiving of any sort has a big price in wasted space. I think I'll stick with perfecting InCD, or better yet, get a relatively cheap external firewire/USB hard-drive for temp storage, then burn complete ISO CD-Rs as needed. (K2) from http://www.mscience.com/faq67.html "When should multisession recording be used? Only when you are forced to use it. Hopefully never, unless multisession is required by a format such as Photo CD. Multisession efficiently supported several recording sessions, enabling one session to use only a fraction of the capacity of an expensive CD-R disc. Media is now inexpensive, and cost savings from multisession recording are insignificant. Packet recording methods are much more efficient, but initially required specialized software and expensive drives. Packet capable software and drives for CD-R and CD-RW are now readily available and affordable.......Multisession has a high overhead. Lead-in and lead-out of the first session occupy 28 MB that is reduced to 13 MB for all following sessions. Twenty sessions therefore have 275 MB of overhead, and only 378 MB is available for user information. Packet recording is highly efficient because twenty packets have only 0.28 MB of overhead." |
#25
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.. --------------------------------------
Mike Richter, were you born with "Scam Artist" emblazoned on your face? -------------------------------------- (Mike Richter, any Material Connection w/ Roxio?) K2 wrote: Answering most of my own questions below, it looks like multisession archiving of any sort has a big price in wasted space. I think I'll stick with perfecting InCD, or better yet, get a relatively cheap external firewire/USB hard-drive for temp storage, then burn complete ISO CD-Rs as needed. (K2) [2-5] What's a multisession disc? http://www.cdrfaq.org/faq02.html#S2-5 [7-6] How much data can they hold? 650MB? 680MB? http://www.cdrfaq.org/faq07.html#S7-6 from http://www.mscience.com/faq67.html "When should multisession recording be used? Only when you are forced to use it. Hopefully never, unless multisession is required by a format such as Photo CD. Multisession efficiently supported several recording sessions, enabling one session to use only a fraction of the capacity of an expensive CD-R disc. Media is now inexpensive, and cost savings from multisession recording are insignificant. Packet recording methods are much more efficient, but initially required specialized software and expensive drives. Packet capable software and drives for CD-R and CD-RW are now readily available and affordable.......Multisession has a high overhead. Lead-in and lead-out of the first session occupy 28 MB that is reduced to 13 MB for all following sessions. Twenty sessions therefore have 275 MB of overhead, and only 378 MB is available for user information. Packet recording is highly efficient because twenty packets have only 0.28 MB of overhead." |
#26
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