160gb+160gb=280 hours?

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160gb+160gb=280 hours?

I used the LBA48-301DD PTVupgrade LBA48 4.01 with Enhancements CD along with the "huge" 4.x upgrade guide to install two 160gb drives in a DSR7000. I skipped the dss steps as this is not a rid unit. When all was done, the TIVO reports 280 hours available. I know the "huge" guide leaves a lot of files on the drives, but I thought I'd get over 300 hours. Is 280 hours correct?
thanks