A friend just asked me about upgrading a HDR so I said he needed a AV disk, such as WD10EVDS. However those now seem to be difficult to get hold of and the replacement - WD10EURS - is an 'Advanced Format' disk, i.e. it uses 4096-byte sectors internally instead of the old standard of 512-byte sectors. I believe that in principle the disk should work with OS drivers expecting 512-byte disks but what of the practice? Has anyone successfully used a 4k byte sector disk in a HDR?