how much do we need the cd if we need to transfer 40 gig files?

Q: ??

A: Your average CD has a capacity of about 800Mb so (1024Mb = 1Gb, 40 x 1024 = 40024Mb / 800Mb = 50.03) you would need at least 51 disks!. I would recommend using a portable hard disk drive instead, like this one: http://www.amazon.co.uk/WESTERN-DIGITAL-Passport-Essential-External/dp/B00164BWAG/ref=pd_sbs_ce_45 or a bit torrent file share as 40Gb is alot of data.

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