What's the difference between DVD-R and DVD+R? and are at hand 240mins blank DVDs? please sustain!?
Answers: Well, nearby are really only two "families" of DVD at the moment (unless you want to count the red laser vs. blue laser stuff that's starting to come on to the souk at the high end), and one "outcast". You've get the "minus" ("-") formats (DVD-R, DVD-RW) and the "plus" ("+") formats (DVD+R, DVD+RW), then there's the elder DVD-RAM format that's harder to find these days. All of these are for background, of course -- adjectives but the newest DVD video players will choke on those, within the same passageway early compact disc players choked on CD-R discs.
A DVD-R is a write-once format: once you've burned the data onto that DVD platter, the disk is forever frozen beside that information. Add the "W" to that, and you'll find that DVD-RW can be erased or rewritten up to a thousand times. Seems kinda weird, but if you can do so, DVD-RW appreciably has significant advantages over DVD-R. DVD-RAM be even more flexible, however, since it let you erase and rewrite section of an existing DVD, something that you cannot do with DVD-RW.
Moving to the plus side is where on earth things get a bit confusing, because DVD+RW come before DVD+R. The plus formats enjoy the same information storage capacity as the minus formats (4.7GB), but DVD+RW offer faster writing, better internal linking (a technical obscurity you don't own to worry about), and support for drag-and-drop desktop files, which make it easy to compose the contents of a disk. DVD+R is a write-once format intended to be more compatible next to more DVD players, though at this point it seems to be going on for even with DVD-R, which remains the most compatible computer-burned DVD format.
In your luggage, since your drive is a DVD-RW, you're effectively limited to DVD-R and DVD-RW format discs. Stay away from any of the "plus" formats, as those won't work next to your drive (and being newer, they cost more anyway). As to whether you want to use DVD-R or DVD-RW, that depends on what you want to use them for. DVD-R is a write-once format, a short time ago like CD-R, and you can't erase the facts once it's written. DVD-RW is rewritable, so you can use it somewhat like a 4.7GB floppy disc, for adjectives intents and purposes. In general, I suggest that you use DVD-R for archival purposes -- stuff that isn't going to adaptation, and DVD-RW for more fluid data. DVD-RW discs are more expensive than DVD-R discs, so that may also influence your edict.
How do you confirm what format your drive works with? One method, if you're on a Mac, is to use the System Profiler application. You'll find this useful utility surrounded by Applications -> Utilities. Launch it, then click on the "ATA" item on the schedule. If you have an internal DVD burner, you'll see something approaching what I get: "PIONEER DVD-RW DVD-106D". If it's an external DVD drive, you might find it surrounded by SCSI, USB or FireWire, depending on how you hook it up.
As far as your second question, your data-burning application clearly has to be aware of the DVD format you want to use (i.e. DVD-R or DVD-RW surrounded by your case). For Windows, you can use GEAR for burning CDs, but you'd need to upgrade to GEAR Professional Edition to be capable of burn both CDs and DVDs. Toast Titanium does burn DVD-R and DVD-RW so you should be set in that department.
A 240 min disc? don't you suggest, how can I put 240 mins on a DVD & the answer is, Record it in LP mode.
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