I have set up 2.4 speed for cdrw but it was writted with 10x speed.
The log:
I 22:21:49 Source File File System(s): ISO9660; UDF (1.02)
I 22:21:49 Destination Device: [1:0:0] _NEC DVD_RW ND-4551A 1-85 (E:) (ATA)
I 22:21:49 Destination Media Type: CD-RW (Disc ID: 97m26s65f) (Speeds: 10x)
I 22:21:49 Destination Media Sectors: 359