Just an FYI and so that things don't get too confusing. Huge difference between sony DLs (OP's topic) and sony SLs.
The sony DLs mentioned by skipriffe are Ritek...my guess is that they're D01...crap. You can get some decent burns (talking movie bkups here, not other data), but they are marginal, very inconsistent, even in the same spindle. I used 'em for one purchase before I could find verbs at a decent price and learned my lesson. On the other hand, I've gotten some decent burns from RICOHJPN D00, also sold under the Ritek brand. Much, much improved over the D01, but not up to the verbs for sure. I had purchased 3 spindles last summer from newegg...luckily 2 of the spindles were D00 and only 1 was D01...whew!
Would I recommend purchasing any Ritek DL to anyone? No, especially since verbs are widely available and cost $1.50 or less...sometimes delivered.
The sony SL media (manufacturers are sony and Taiyo Yuden) are a totally different story. While they seem to have a bit more trouble with compatibility overall, they are high quality media.
Still, it's hard to go wrong with Taiyo Yuden and Verbatim.
Just my 2 cents.