$ dvd+rw-mediainfo 
usage: dvd+rw-mediainfo /dev/dvd
alek@darkstar:~$ dvd+rw-mediainfo /dev/sr1
INQUIRY:                [Optiarc ][DVD RW AD-7203S ][1.04]
GET [CURRENT] CONFIGURATION:
 Mounted Media:         10h, DVD-ROM
 Media ID:               TYG03      
 Current Write Speed:   6.0x1385=8310KB/s
 Write Speed #0:        18.0x1385=24930KB/s
 Write Speed #1:        16.0x1385=22160KB/s
 Write Speed #2:        12.0x1385=16620KB/s
 Write Speed #3:        8.0x1385=11080KB/s
 Write Speed #4:        6.0x1385=8310KB/s
 Write Speed #5:        4.0x1385=5540KB/s
GET [CURRENT] PERFORMANCE:
 Write Performance:     6.0x1385=8310KB/s@[0 -> 1642016]
 Speed Descriptor#0:    00/1642016 R@16.0x1385=22160KB/s W@18.0x1385=24930KB/s
 Speed Descriptor#1:    03/1642016 R@16.0x1385=22160KB/s W@16.0x1385=22160KB/s
 Speed Descriptor#2:    03/1642016 R@12.0x1385=16620KB/s W@12.0x1385=16620KB/s
 Speed Descriptor#3:    00/1642016 R@8.0x1385=11080KB/s W@8.0x1385=11080KB/s
 Speed Descriptor#4:    00/1642016 R@8.0x1385=11080KB/s W@6.0x1385=8310KB/s
 Speed Descriptor#5:    00/1642016 R@5.0x1385=6925KB/s W@4.0x1385=5540KB/s
READ DVD STRUCTURE[#0h]:
 Media Book Type:       00h, DVD-ROM book [revision 0]
 Legacy lead-out at:    1642016*2KB=3362848768
READ DISC INFORMATION:
 Disc status:           complete
 Number of Sessions:    1
 State of Last Session: complete
 Number of Tracks:      1
READ TRACK INFORMATION[#1]:
 Track State:           complete
 Track Start Address:   0*2KB
 Free Blocks:           0*2KB
 Track Size:            1642016*2KB
 Last Recorded Address: 1642015*2KB
FABRICATED TOC:
 Track#1  :             14@0
 Track#AA :             14@1642016
 Multi-session Info:    #1@0
READ CAPACITY:          1642016*2048=3362848768