Wrote my first DVD-R this weekend (onto a datawrite x4 fuji whatsit). It was a dump of a TV programme of about 1.5 hours from my TiVo it wrote ok, played ok. Then I finalised it and it came up err=13 on the display ejected the disc, re-inserted it and it plays fine. Tried the disk on a laptop upstairs and it worked fine in that (Dell CDRW/DVD Reader). Took it to work and it wouldn't work on a HP laptop (CDRW/DVD Reader) and a HP desktop (DVD Writer). Put it my HP desktop (CDRW/DVD Reader) and it was fine. Its the same model of desktop, not sure (yet) about makes of drive any ideas to make it more compatible.