OK watched it like a hawk.
first burned an iso image to remove the stress on the burning phase.
then wrote the iso using k3b which uses growfs.
exactly on the 25 gig point it failed.
exactly as it switched layers if thats how it works
[14776.724786] usb 2-5: reset SuperSpeed USB device number 3 using xhci_hcd
[14784.724799] usb 2-5: reset SuperSpeed USB device number 3 using xhci_hcd
[14801.551866] sr 11:0:0:0: [sr1] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[14801.551875] sr 11:0:0:0: [sr1] tag#0 Sense Key : Blank Check [current]
[14801.551876] sr 11:0:0:0: [sr1] tag#0 Add. Sense: No additional sense information
[14801.551878] sr 11:0:0:0: [sr1] tag#0 CDB: Read(10) 28 00 00 00 00 60 00 00 01 00
[14801.551880] print_req_error: critical target error, dev sr1, sector 384
[14941.082538] attempt to access beyond end of device
[14941.082541] unknown-block(11,1): rw=0, want=388, limit=4
so is it mageia utils dont support 50 gig devices, or is it my blueray, which is a 50 gig device.
regards peter