I got them to preview videos over 25 gigabytes and they do a great job. However, you must keep the surface of the disc clean otherwise you will get validation errors and hence playback errors. Otherwise, be prepared for long waits as recording 50 gigs at 2X (or less on some burners) can take close to an hour.
π Smartbuy 700MB/80min CD-R Blank Data Recordable Media Discs - Pack of 100, 52x Speed, White Top
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Sony 50DMR47SP DVD R 4 7GB Recordable
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π Verbatim BD-R 25GB 6X Blu-ray Recordable Media Disc - 3 Disc Jewel Case Box - 97341: High-Capacity Blu-ray Recording for Optimal Storage
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PlexDisc DVD-R 4.7GB 16x Recordable Media Disc - 100 Disc Spindle: Reliable and High-Quality Data Storage Solution
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