I was originally getting brilliant quality burns with my iHAS 224 (converted to a 624) with Verbatim MKM-003-00 discs, but then in the last couple of days I've had a few coasters and the burn quality went to crap for no apparent reason. I spoke to Lightning UK (the creator of ImgBurn) and he gave me some different settings to try, and now I'm getting results like this: - Here are the new settings I'm using: - 1. Clear OPC history with EEPROM Utility and power cycle the drive (only needs to be done once). 2. OPC, OHT, OSW = Disabled. 3. FHT, SmartBurn = Enabled. 4. Burn speed = 4X. Lightning UK's tests (he did loads of test burns with Verbs) showed that disabling Online Hyper Tuning made a big difference in terms of consistently getting good burns and that it was better to leave OPC off, even when burning at 4X. Again, your mileage may vary, but if you're getting inconsistent burns even with good quality media then give these settings a go.