I saw some scans you posted in another thread recently and they show your firmware version as KFS1, not KYS1 as posted above. This is from a different series (probably specific to your Sony Vaio machine) and explains why the KYS4 flasher refused to recognize your drive. Have you searched the Sony Vaio site for updates in the form of KFSx?
If there's nothing recent there, you can consider "crossflashing" to a different firmware series to get better media support, but this is for the more experienced and will void your drive's warranty. If you choose to do so, it's recommended to back up your current firmware and eeprom chip with tools like LtnFW and EEPROM Utility first. Read up on these and follow the included instructions carefully.
For crossflashing you should know that there are three identical drive models (that share the same hardware, except for their label and front bezels) to yours. These are:
Sony Q28A (f/w KYS4)
Sony 800A (f/w KY06)
LiteOn 1693S (f/w KS0B)
Please use ONLY these.
You can find respective firmwares on the codeguys site (see link above in chok0's post). These are "flashfixed" to allow changing from one model to another and back. The reason he suggested 1693S firmware is because this is considered the best by many users of this drive. If you're going to crossflash anyway, you might as well use that one. The "patched" version includes further enhancements by C0deKing over the "stock" LiteOn release.
Sorry for the crash-course, but this will give you a better understanding of what's happening. I hope it works out OK.