If you want to store files then DVD-RAM is a much better choice, as it is sector based. You can get drives which do DVD-RAM and DVD-RW, I think some also do both +/- versions of both formats.
I use DVD-RAM for data backup on my PC, and also my DVD VCR uses that format.
I use DVD-RW to make up test video DVDs before I burn permanently to DVD-R.
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