Imation DVD+RW 4x:
root@1[raid]# dvd+rw-mediainfo /dev/hdc
INQUIRY:                [LITE-ON ][DVDRW LH-20A1P  ][KL0G]
GET [CURRENT] CONFIGURATION:
 Mounted Media:         1Ah, DVD+RW
 Media ID:              OPTODISC/OP4
 Current Write Speed:   4.0x1385=5540KB/s
 Write Speed #0:        4.0x1385=5540KB/s
GET [CURRENT] PERFORMANCE:
 Write Performance:     4.0x1385=5540KB/s@[0 -> 2295103]
 Speed Descriptor#0:    00/2295103 R@12.0x1385=16608KB/s W@4.0x1385=5540KB/s
READ DVD STRUCTURE[#0h]:
 Media Book Type:       00h, DVD-ROM book [revision 0]
 Legacy lead-out at:    2295104*2KB=4700372992
READ DISC INFORMATION:
 Disc status:           complete
 Number of Sessions:    1
 State of Last Session: complete
 Number of Tracks:      1
 BG Format Status:      suspended
READ FORMAT CAPACITIES:
 formatted:             2295104*2048=4700372992
 26h(0):                2295104*2048=4700372992
READ TRACK INFORMATION[#1]:
 Track State:           complete
 Track Start Address:   0*2KB
 Free Blocks:           0*2KB
 Track Size:            2295104*2KB
FABRICATED TOC:
 Track#1  :             14@0
 Track#AA :             14@2295104
 Multi-session Info:    #1@0
READ CAPACITY:          2295104*2048=4700372992
root@1[raid]#

Maxell DVD-RW 2x:
root@1[raid]# dvd+rw-mediainfo /dev/hdc
INQUIRY:                [LITE-ON ][DVDRW LH-20A1P  ][KL0G]
GET [CURRENT] CONFIGURATION:
 Mounted Media:         14h, DVD-RW Sequential
 Media ID:              OPTODISCW002
 Current Write Speed:   2.0x1385=2770KB/s
 Write Speed #0:        2.0x1385=2770KB/s
GET [CURRENT] PERFORMANCE:
 Write Performance:     2.0x1385=2770KB/s@[0 -> 0]
 Speed Descriptor#0:    00/0 R@4.8x1385=6648KB/s W@2.0x1385=2770KB/s
READ DVD STRUCTURE[#10h]:
 Media Book Type:       00h, DVD-ROM book [revision 0]
 Legacy lead-out at:    2298496*2KB=4707319808
READ DVD STRUCTURE[#0h]:
 Media Book Type:       32h, DVD-RW book [revision 2]
 Last border-out at:    2045*2KB=4188160
READ DISC INFORMATION:
 Disc status:           blank
 Number of Sessions:    1
 State of Last Session: reserved/damaged
 "Next" Track:          1
 Number of Tracks:      0
READ FORMAT CAPACITIES:
 no media:              4101552*2048=8399978496
 00h(800):              2297888*2048=4706074624
 10h(10):               2297888*2048=4706074624
 15h(10):               2297888*2048=4706074624
READ CAPACITY:          0*2048=0
root@1[raid]#