Hi, Today I had some spare time and did some experiments with AnyDVD HD. I was doing binary comparison of .m2ts files on Blu-ray disc (Fantastic 4) with AnyDVD enabled with those backed up to a hard drive some time ago using BackupBluRay tool. Here are my findings, some are very strange and weird, which I don't know how to explain. I used "Beyond Compare" (with Hex Viewer plugin) and also "010 Editor" to do file comparison. First, I found that all .m2ts files (except one) created by BackupBluRay have several kilobytes of extra data at the end. This I guess is OK. Probably it is because BackupBluRay appends all buffer data to the file on the last iteration while it should cut off some. Second (and here strange things begin): For all small .m2ts files there were additional differences INSIDE the files. One block of differences (and it was common to all small files) started at position 00020000 and was exactly 1KB in size. Big 17GB .m2ts file (I was only able to compare it using 010 Editor) did not have any differences inside. Third: After the comparison of the big file finished, I checked those small files again. To my amazement, now differences DISAPPEARED! Both 010 Editor and Beyond Compare were now reporting that there were only differences at the end (those extra bytes). Fourth: I ran the comparison of big .m2ts file in 010 Editor again, and at the same time ran the comparison of one of the small .m2ts files in Beyond Compare. Now I heard that the laser head was rapidly moving from one position to another, and this slowed down everything. So I pressed 'Cancel' in both programs. But for the data they processed that far, they showed A LOT of sections with differences. This clearly indicates about some kind of IO or synchronization problems... Some pictures and AnyDVD info attached. When doing this comparison, I was running Windows XP. I also have Roxio burning software (EMC 9) installed. Virtual CloneDrive and CloneDVD2 are installed as well. BTW: on the web site you say: "AnyDVD comes with a UDF 2.5 file ripper, no need to install 3rd party UDF 2.5 filesystem under Windows XP". But I still could not see Blu-ray disc files in Windows Explorer until I installed Roxio. (I was just reinstalling the whole system a week ago). I hope that you clarify the issues I found. P.S.: I recently bought the whole bunch of your programs using 'cricket' discount!