PROBLEM SUMMARY STATEMENT: Windows 7 believes my DVD drive will only burn approximately 2.5 GB worth of content to a 4.7GB DVD-R. DVD Drive is recognized for read, but only incorrectly for write operations. I have googled a bit and found solutions to dvd drives not being recognized and other general problems, but nothing specific to the very strange problem I have. I have 64 bit windows seven installed on a reasonably new hp pc (about a year old) This is a special pc, for work only (primarily video editing, dvd creation). I do not keep this pc internet connected as it is too critical to my work. I only connect as needed to update drivers and such. Originally PC was Vista, but I upgraded to Win7. Everything worked fine for many months (including the dvd burner). Then, suddenly the dvd drive began to misbehave. The problem I have is that Windows does not recognize the size of the drive. I first noticed the problem when I was using explorer to write some large (roughly 4GB files) mpg files to DVD for backup. Windows DVD wizard tells me the files are too large to burn. I rebooted the PC many times, connected to the net and tried to update the driver, but to no avail. I found imageburn would bypass the problem with explorer and allow me to burn DVD's with large backup files. Unfortunately, my editing/dvd authoring software (Pinnacle 14) seems to defer to windows to report the size of the disk. Thus I cannot render an ISO or VOB file using Pinnacle as it now seems to accept the new size of the DVD burner (roughly about 2.5 G as Windows must be reporting it through some API function. What this means is that I can't create an ISO file to use with ImageBurn since Pinnacle keeps telling me my project file is too large for the DVD burner. Installing a USB external dvd burner did nothing to alleviate this problem. I am doing advanced dvd authoring that requires Pinnacle or another robust product to generate my image file. Now I need to transport my MPG input files via USB drive to a second computer, where I can successfully author the disk. However as this is a regular tasks I perform, this is a real pain. I found what appeared a solution online. Using F8 I was able to "Disable Driver Signature Enforcement" and create a disk image ISO file. However when I tested a disk I burned from the ISO, the chapter stops were not recognized. Even worse, I rebooted and tried to "Disable Driver Signature Enforcement" again to retry, but that solution no longer functions. Once again, the machine worked with Win7 for months. I installed no new software. Machine was not connected to internet at the time the problem emerged. Has anyone heard of such a problem before? Any help or advice?