Are these discs 8GB each, or total?

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I see 8.5GB each.

My bet is that's 8.5 Billion Bytes. However don't use these for booting. Too many machines cough on that.

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Something else in mind? You can't mean 8GB in 50 discs.

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Standard DVDs hold 4.7 GB, double layer ones double that.

I've got some of these double layer DVD-R discs. I had to make copies of a disc I got from Dell with more than 4.7 GB on it. It's nice that these have greater capacity, but avoid them if you can because as Bob suggests, these are very finicky. When I tried making copies at default speeds, it crapped out in the middle of the copies. I had to slow it down to 2X to get it to work.

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For get I ask.

I think I know what you are thinking. You are thinking of "double sided" discs. I don't they make them anymore.

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Not "double sided", dual layer, see this link
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The reason I ask is because ...

... the reason I'm concerned is because I bought a spindle of discs once before. There were 30 discs, and they advertised 25GB. When they arrived in the mail, they were actually about 853-854MB each, for a total of 25GB.

I don't want to get screwed like that again.

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Sounds like CDs rather than DVDs

The storage difference is vastly different.

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What store was this?

I want to avoid them also. However if the price are of cd then they didn't cheat you (lie yes but not cheat). Actually 25GB would led me to think it's BD.

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It was newegg, actually.

I just assumed that was a standard advertising. Kind of like how USB drives will advertise a certain number of gigabytes, but the actual amount of storage is lower, because 64GB advertised means precisely 64,000,000,000 bytes, whereas the computer considers 64GB to mean 68,719,476,736. I just assumed it was the sort off thing you need to be aware of.

Also, what's BD? I know what BR is (Blu-Ray), but not BD.

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then I think it's just a misunderstanding. BD is Blu-ray Discs.

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