TrustedReviews has posted a review of the Toshiba SDR-5372 DVD Writer which can write to DVD+R DL media at 5x.

Looking at the specifications of the SDR-5372, shows a drive that’s cutting edge in some areas, but a little behind the pack in others. DVD+/-R discs can be written at 16x, which is up there with the best, while the
aforementioned 5x DVD+R DL performance is bettered only by the Asus DRW-1608P. But it’s when we get to the re-writing speeds that this Toshiba looks a bit shaky, with only 4x performance for both DVD+RW and DVD-RW media. CD performance is respectable, with CD-R discs burned at 48x and CD-RW media written at 24x - again, up there with the best.

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