harley’s advice is good. Other points are that Fry’s generic discs are known to typically be pretty marginal media at best, although some of their newer ‘GQ’ discs are decent, depending on the media code. You can get the media code, which tells you who actually makes the discs, by using a program such as Nero CD-DVD Speed and checking the media code with it. Another issue is that Sony burners are typically average burners, you will probably run into alot of issues with cheap media on lesser burners. Make sure you update your burner to the latest firmware available though, as they may have improved the firmware enough to allow you to burn them. If you do get one to burn, check the burn quality with a Transfer Rate test using Nero CD-DVD Speed (your burner doesn’t support other testing). A relatively smooth graph indicates a decent burn, multiple severe dips in read speed or a premature end to the test indicate poor burn quality that will cause unreadable portions of the disc, skipping and freezing issues of the disc, etc.
One good alternative would be these - http://club.cdfreaks.com/showthread.php?t=154140. 4x media is getting pretty hard to find and the discs in the thread I linked to are great discs, you should have no problems with them. Shipping is expensive but if you order 2 spindles the overall cost would be about $24 per 100, a great price for them. You can also look into the ‘value’ Taiyo Yuden discs, they sell for around $30 shipped at several retailers and are good discs. You would probably be better off trying 4x media on your burner, as newer 8x and faster media typically burns better at their rated speed and older burners such as yours often have poor support for newer, faster discs.