My main use will be for back-ups (some long term and some to be rotated and therfore overwritten).
It seems to boil down to -R or +R for long term (or possibly +R DL). And -RW or +RW for rotation.
What are the "preferred" type of media to use for these purposes? Really comes down to is - or + better? I assume DVD-RAM is best reserved for use as a big floppy and so may not be the most appropriate.
I currently use a DVD+RW for my usual back-up which gets refreshed when I remember. When I get a new drive, should be this week, I will use DVD+R DL to create a full system back-up for reinstallation when it all goes down the pan.
i have had some trouble with + format, i bought some cheap "datasafe" brand discs from a computer fair, backed up my system and about two months later when i try to access them i get a "data cyclical error" message and some files are not retrievable. got most of the data back but lost a few files. lesson to me to stick to what i know works rather than saving 50p on a spindle of 25.
all other + & - discs i have used have worked without fault so im going to put it down to bad luck or a bad batch etc.
i am currently using - format for backups just because i wont use the + discs i have got left.
Basically then i dont think there is any difference between the two.