DVD-R vs. DVD+RW

In trying to determine the best media data storage method, I've been informed that DVD-R is one session and permanent while DVD+RW is multi-session and to some extent reusable. As I understand it, you burn something to DVD-R once and that's it--so if it doesn't fill up the whole disk it's kind of a waste, and if you make a mistake burning it you'd better find a creative decorative use for the disk as it's no earthly use ever again for any kind of media storage. With DVD+RW you can redo and add to things until you get them the way you like.

So I have a few questions.

1. Are there ANY advantages to DVD-R over DVD+RW?

2. Is the quality any better?

3. Are DVD+RW disks susceptible to accidents such as unintentionally being erased, and DVD-R not?

And, lastly

4. If you complete a DVD+RW disk is there any way to make it permanent (such as there is by locking a video or cassette tape)?

Thanks for any clarification as to reasons why for these different methods of storage!

Power Mac G4, Mac OS X (10.2.x)

Posted on Dec 23, 2005 12:52 AM

Reply
24 replies

Dec 23, 2005 2:05 AM in response to Cornelia Shields

1. The discs are cheaper and can't accidently be erased. The DVD-R discs are also much more compatible with set top DVD players connected to a TV.

2. The same.

3. Yes.

4. No.

Note that there are also DVD+R discs as well as DVD-RW. The +-RW discs can be erased, where +-R can not.

With +-RW you can erase the disc. And I mean erase the disc: You can't remove just one file and let the rest stay.

Finally, you can't add another video to a DVD+-RW disc and have it play on a set top DVD player connected to the TV.

Dec 23, 2005 6:15 PM in response to Ricktoronto

Well, I ordered a couple of DVD+RW disks because this is what I want to do:

1. Burn one movie (series of clips) onto DVD.

2. Redo it if it comes out wrong the first time without the disk being toast after one try.

3. Possibly add another movie (series of clips from a different file) onto the same DVD, after the first one.

4. Maybe even put more short movies onto the same disk after these two if I have more later.

Is this possible, yes or no? Thanks.

Dec 23, 2005 6:46 PM in response to Cornelia Shields

For 1 and 2 use a disk image and no DVD at all. Then play the image and see if you like it. It mounts and behaves like a real DVD exept it is not really there.

You cannot "add" content to a DVD (from iDVD for example). When it is made, it has a specific file structure and is finished. To add more clips you'd have to reopen the DVD project and add more clips, re-render and see how it goes.

I strongly recommend Toast 7 to make DVD's from a few clips - it has nice menus and if you don't tell it to trash its rendered files it doesn't re-render them as to add more.

You can make a disk image with it (to mount and play) as well and if it turns out a little big for one DVD it will recompress that image and make one that will fit.

Dec 24, 2005 12:58 AM in response to Ricktoronto

I don't know what a disk image is. In any case, for the finished project I need something that will play in my DVD player.

The disks I bought say they will hold over two hours of material. My titles, in the one project, are about five minutes, and the outtakes, which I'd like to save as another project, might be twice that, so should not use up a two-hour DVD! Even if it's rewritable, are you saying I can't add more to it later? What's the point of having over two hours of space and multiple session capability if you can't use them and have to have a new disk for every 5-minute project?

Dec 24, 2005 5:13 AM in response to Cornelia Shields

Hi Cornelia:

I don't know what a disk image is.


Here is an explaination:

http://docs.info.apple.com/article.html?artnum=42724

Also, you can add more than one video file to one dvd-you just have to combine them before the burn, it has always been that way for all non-rewritable media.

I quote Ken Tidwell:
How can I combine two movies from iMovie and burn one DVD disc?
The first one can be handed off directly from iMovie to iDVD, but as you may have found, if you repeat that process, it will simply mean a new (single movie) project in iDVD.

You need to use the iMovie menu: 'File/Share/QuickTime/Full Quality DV' and save the second movie from iMovie to your hard drive, and then add that asset manually to your current iDVD project, either via the 'Import/Video' menu, or thru the 'Customize/Media/Movies' panel/tab...or, of course, via drag/drop into the main theme window - locate your movie in the iMovie project folder and bring it over to your iDVD main project window. Hold down the CMD key when dropping to avoid any motion menus. Finally, to use the existing theme with any additional new menu pages, use the iDVD menu, 'Advanced/Apply Theme to Project'.

http://www.kentidwell.com/idvd4/

Sue

Dec 24, 2005 7:00 AM in response to Cornelia Shields

You could look up disk image in Apple help, then post if (unlikely) still somewhat unclear, Cornelia.


Regardless of the image thing which is a preferred method for testing (and easier on the Mac at times) - Even with an RW disk you can't make a complete DVD then add another DVD to the DVD even if there is room.

All DVDs are a complete entity with a special file structure, table of contents etc., and can have multiple titles or chapters but not multiple DVD structures on one disk. In essence, a 30 second DVD if you wanted one that short uses ALL the DVD when made.

You can, as I told you , re-open the DVD project and add more media and make a new DVD with TWO items and so on. Then yes, you could erase the RW and reburn to it again.

keep in mind that it IS possible that the blank DVD making people do not think that all DVD users will do nothing but 5 minute projects and thus the 2 hours is rather handy for 99% of all users, vs. a problem for most , as it seems to be for you in this case.

Also please note in a LOT of cases that home DVD players do not play RW very well or at all and the write once media is recommended - with +R with the best compatibility, then -R then RW + or RW - ,way down the list.

You might find Toast vs. iDVD for doing a lot of separate little projects is easier to understand and use and make images and so on that iDVD frankly. I have read your one person "Can"opus on your ADC100 problems and I think you'd find Toast more intuitive and easier to make DVD's on.

Dec 24, 2005 1:25 PM in response to Ricktoronto

Is Toast 7 a method of making disk image(s) or DVD(s), or are we talking about several different things here?

Also, the reason I bought +RW disks and TWO of them at that is that it seems ANYTHING I do needs to be done about ten times to be right ONE time (hence five days to get titles that play the way I want) and the thought of a "write-once" disk scares me.

You know that song, "Mamma's Going to Buy You a Mockingbird"? If this doesn't work, then that, if that doesn't work, the next, and so on.

If the +RW disk won't play in my VCR, I will try playing it on my combo drive in my Mac. If it plays, I'll see if there's a way to connect the VCR to the Mac and copy it to videotape from that so I can finish the rest of the project! (The reason I don't go direct from the Mac to the VCR, besides the generational loss of digital to tape, is that I want the opening titles at the beginning, the middle title in the middle, the closing titles at the end, and the outtakes after that, and if I have to string them all together into ONE project I don't see HOW I can put them where I want on the tape without a DVD I can start and stop!) If that won't work, I'll copy it either from the +RW disk or (if I dare!) directly from whatever format seems best to a -R disk my friend gave me. If none of these work, then I panic.

Dec 24, 2005 1:54 PM in response to Cornelia Shields

Since this has both to do with the recording method (to DVD or not to DVD) and the exporting method (how to get the clips from iMovie to VHS tape on the VCR) I'll post this same statement under both threads.

Okay, one advantage if I was able to take things directly from iMovie to a VCR, is, presumably I could select and play each clip separately and could make it come out exactly where on the tape I want. Presumably a DVD can also be advanced or wound back to find a precise point as well.

This statement is to clarify my thinking on generational loss as far as picture and sound from either method. If my reasoning is in any way lacking in these matters, please correct me. The information in iMovie is digital, as is the DVD disk. The VCR is made to copy from DVD so it is my reasoning that tapes made from a DVD disk would come out clear as opposed to trying to take the movie directly off the Mac to the VCR. Of course, I should experiment with both before making anything permanent to compare quality. If I couldn't tell the difference in quality of the finished tape, I should do the method with the least steps. Is this reasoning correct or not?

Dec 24, 2005 2:38 PM in response to Cornelia Shields

iMovie processes digitally a DV codec file that is infinitely better quality than a DVD even though they are both digital. You can squeeze a movie that is 1 hour/13GB of DV down to 250KB if you compress it enough. They are both digital, there is a HUGE loss of quality.

Every VCR has such low resoution compared to DVD (and MUCH lower than DV from the source tape) your thoughs that you will have a perfect copy from DV to DVD are wrong and DVD to VCR are worse.

You should really figure out how to use that Canopus properly, let it do the digital to analog conversion once to the VCR which apparently it will do looking at the diagrams etc. What you seem to have ignored in previous attempts to help is that Canopus does not say that iMovie works with it at all (only Final Cut).

Borrow a DV tape videocamera (or take back the useless Canopus and buy one) - use it's Analog to Digital feature to capture non digital sources, use it as a DV to make movies and use it to output the iMovie to tape then that can be "played back" into a VCR.

A digital transfer from iMovie to a DV tape is the ONLY lossless method to make a perfect digital copy of the iMovie (other than just making a copy of it on the hard drive of course). iMovie to DVD you lose a lot, to VCR more than a lot, most.

You need to read up on iMovie and things -try the Missing Manuals series of Books - there is a great one called iMovie HD/iDVD that covers all these types of subjects.

Note - Toast 7 is software from Roxio that makes CD and DVD burning easier than using the finder and also makes DVD's from various QT and other source material.

Dec 24, 2005 2:41 PM in response to Cornelia Shields

Is Toast 7 a method of making disk image(s) or
DVD(s), or are we talking about several different
things here?


YES. IT IS AN ALTERNATIVE TO IDVD.

Also, the reason I bought +RW disks and TWO of them
at that is that it seems ANYTHING I do needs to be
done about ten times to be right ONE time (hence five
days to get titles that play the way I want) and the
thought of a "write-once" disk scares me.


SO IF YOU MAKE DISK IMAGES FIRST YOU DON'T BURN ANYTHING AND CAN TEST IT OUT FIRST.
You know that song, "Mamma's Going to Buy You a
Mockingbird"? If this doesn't work, then that, if
that doesn't work, the next, and so on.


YOU WOULD BE BETTER OFF LEARNING A BIT MORE SEE THE PRECEDING POST
If the +RW disk won't play in my VCR


A DVD CANNOT PLAY IN A VCR

I will try
playing it on my combo drive in my Mac. If it plays,
I'll see if there's a way to connect the VCR to the
Mac and copy it to videotape from that so I can
finish the rest of the project!


YOU CAN'T UNLESS YOU CAN FIGURE OUT YOUR CANOPUS BOX BETTER THAN SO FAR


(The reason I don't
go direct from the Mac to the VCR, besides the
generational loss of digital to tape, is that I want
the opening titles at the beginning, the middle title
in the middle, the closing titles at the end, and the
outtakes after that, and if I have to string them all
together into ONE project I don't see HOW I can put
them where I want on the tape without a DVD I can
start and stop!)


YOU COULD MAKE ON IMOVIE PROJECT THAT WOULD DO THIS, OR SEPARATE ONES, AND USE MULTIPLE CLIPS IN IDVD, BUT HEY YOU'VE BEEN TOLD THAT AND WON'T LISTEN, SO GOOD LUCK.


If that won't work, I'll copy it
either from the +RW disk or (if I dare!) directly
from whatever format seems best to a -R disk my
friend gave me. If none of these work, then I panic.

Dec 25, 2005 11:42 PM in response to Lennart Thelander

The Canopus converter was not totally useless. It got the clips from my video camera to iMovie beautifully, just having trouble getting them back out unscathed.

And, to clarify: I KNOW a DVD won't play in a VCR. My player is a combo VCR/DVD which is made to play both VHS and DVD, and record from DVD to VHS but not the other way around--that's why my original thinking was, if I only had this material on DVD I could put it straight to VHS tape from the DVD just as I can put the 8mm tape shot on my camera straight to VHS tape. Now people are telling me that there'll be all this loss of resolution, etc., which doesn't occur when dubbing from the camera, so I'm still looking into my options short of buying another $200 piece of equipment. (Personally I wish I could just borrow someone's digital video camera long enough to get the job done.)

Dec 29, 2005 1:48 AM in response to SDIllini

I looked over the disk image instructions and they don't seem like something I can use for several reasons.

1. It mentions a SuperDrive; I have only a Combo Drive.

2. It's instructions for copying a disk that's already been burned and I haven't burned mine yet.

I have something in iMovie and have to figure out 1. how to get it onto a DVD and 2. if there's any way to check that the material is good to go before burning the DVD.

I'll look up the Toast instructions and see if those prove of assistance.

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DVD-R vs. DVD+RW

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