Entroper on 04 October 2007
A somewhat more original report: http://techluver.com/2007/10/03/hitachi-displays-100gb-blu-ray-drive/
"Hitachi has developed a prototype four layer Blu-Ray disc capable of holding 100GB of data. The company claims to have used a standard Blu-Ray drive optical head that’s only slightly modified to allow it to read and write data across the four 25GB layers. It’s believed this will only require a firmware update to make existing drives compatible."
If they've modified the head, I don't see how a firmware update would work on existing Blu-ray drives. Of course, the information available regarding this update is rather slim, so we'll have to wait for clarification.
