Just got home and checked one of the verbatum discs
it says
_NEC DVD_RW ND-3550A 1.07 (ATA)
Current Profile: DVD+R DL
Disc Information:
Status: Empty
Erasable: No
Free Sectors: 4,173,824
Free Space: 8,547,991,552 bytes
Free Time: 927:32:74 (MM:SS:FF)
Supported Write Speeds: 2.4x, 4x, 6x, 8x
DVD