I've never tried to burn a DVD-R yet, so I don't if I would get the
"COMMAND SEQUENCE ERROR" message.
The DVD-RW media was burned without problem at 2x speed.

Verbatim DVD-R (4x certified) (empty) on a SONY DRUč510A

:-[ GET CURRENT PERFORMACE failed with SK=5h/ASC=24h/ACQ=00h]: Input/output 
error
:-[ READ TOC failed with SK=5h/ASC=24h/ACQ=00h]: Input/output error
INQUIRY:                [SONY    ][DVD RW DRU-510A ][1.0d]
MODE SENSE[#3Fh]:
 01:    00 05 00 00 00 00 03 00 00 00
 05:    60 c4 08 10 00 00 20 00 00 00 00 00 00 96 00 00
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00
 08:    04 00 00 00 00 00 00 00 00 00
 0D:    00 0d 00 3c 00 4b
 0E:    04 00 00 00 00 00 01 ff 02 ff 00 00 00 00
 1A:    00 03 00 00 00 c8 00 00 12 c0
 1D:    00 00 04 00 00 0a 11 58
 2A:    1f 17 f1 77 29 23 0a d2 01 00 20 00 0a d2 00 00
        15 a4 15 a4 00 01 00 00 00 00 15 a4 00 03 00 00
        15 a4 00 00 0a d2 00 00 05 69 00 00 00 00 00 00
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00
 33:    01 03 00 00 00 00 00 00 00 00
MODE SENSE[#2A]:
 2A:    1f 17 f1 77 29 23 0a d2 01 00 20 00 0a d2 00 00
        15 a4 15 a4 00 01 00 00 00 00 15 a4 00 03 00 00
        15 a4 00 00 0a d2 00 00 05 69 00 00 00 00 00 00
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00
GET [CURRENT] CONFIGURATION:
 0000:  00 1b 00 00 00 1a 00 00 00 14 00 00 00 13 00 00
        00 11 01 00 00 10 00 00 00 0a 00 00 00 09 00 00
        00 08 00 00
 0001:  00 00 00 02
 0002:  00 00 00 00
 0003:  29 00 00 00
 0021:  01 00 01 01 10 00 00 00
 002F:  46 00 00 00
 0100:
 0105:
 0108:  41 45 37 35 32 38 46 41
 Mounted Media:         11h, DVD-R Sequential
READ DVD STRUCTURE[#0eh]:       00 6a 00 00 01 40 c1 fd 9e d8 52 00 02 87 0d 11 
66 78 80 00 03 4d 43 43 20 30 31 00 04 52 47 32 30 20 20 00 05 a8 82 00 20 00 
02 00
 Media ID:              MCC 01RG20  
 Current Write Speed:   4.0x1385=5540KB/s
 Write Speed #0:        4.0x1385=5540KB/s
 Write Speed #1:        2.0x1385=2770KB/s
 Write Speed #2:        1.0x1385=1385KB/s
GET PERFORMANCE:        00 00 00 00 00 23 10 1f 00 00 0a d2 00 00 15 a4 00 00 
00 00 00 23 10 1f 00 00 0a d2 00 00 0a d2 00 00 00 00 00 23 10 1f 00 00 0a d2 
00 00 05 69 
 Speed Descriptor#0:    00/2297887 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
 Speed Descriptor#1:    00/2297887 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
 Speed Descriptor#2:    00/2297887 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
READ DVD STRUCTURE[#FF]:
 STRUCTURE#00           40:2052
 STRUCTURE#01           40:8
 STRUCTURE#02           00:2052
 STRUCTURE#03           40:192
 STRUCTURE#04           c0:2052
 STRUCTURE#05           c0:8
 STRUCTURE#06           40:24
 STRUCTURE#07           40:24580
 STRUCTURE#0c           00:30724
 STRUCTURE#0d           40:32776
 STRUCTURE#0e           40:108
 STRUCTURE#0f           c0:22
 STRUCTURE#10           40:2052
 STRUCTURE#11           00:260
 STRUCTURE#30           00:32772
 STRUCTURE#c0           c0:8
 STRUCTURE#ff           40:72
READ DVD STRUCTURE[#10h]:       25 0f 02 00 00 03 00 00 00 26 12 7f 00 00 00 00
 Media Book Type:       25h, DVD-R book [revision 5]
 Legacy lead-out at:    2298496*2KB=4707319808
READ DVD STRUCTURE[#0h]:        25 0f 02 00 00 03 00 00 00 00 00 00 00 00 00 00
 Media Book Type:       25h, DVD-R book [revision 5]
 Last border-out at:    0*2KB=0
READ DISC INFORMATION:  00 20 00 01 01 01 01 20 00 00 00 00 00 00 00 00
 Disc status:           blank
 Number of Sessions:    1
 State of Last Session: empty
 Number of Tracks:      1
READ TRACK INFORMATION[#1]:     00 22 01 01 00 04 61 01 00 00 00 00 00 00 00 00
 Track State:           invisible incremental
 Track Start Address:   0*2KB
 Next Writable Address: 0*2KB
 Free Blocks:           2297888*2KB
 Track Size:            2297888*2KB

Verbatim DVD-RW (2x certified) (not empty) on a SONY DRU-510A

:-[ GET CURRENT PERFORMACE failed with SK=5h/ASC=24h/ACQ=00h]: Input/output 
error
INQUIRY:                [SONY    ][DVD RW DRU-510A ][1.0d]
MODE SENSE[#3Fh]:
 01:    00 05 00 00 00 00 03 00 00 00
 05:    60 c4 08 10 00 00 20 00 00 00 00 00 00 96 00 00
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00
 08:    04 00 00 00 00 00 00 00 00 00
 0D:    00 0d 00 3c 00 4b
 0E:    04 00 00 00 00 00 01 ff 02 ff 00 00 00 00
 1A:    00 03 00 00 00 c8 00 00 12 c0
 1D:    00 00 04 00 00 0a 11 58
 2A:    1f 17 f1 77 29 23 15 a4 01 00 20 00 15 a4 00 00
        0a d2 0a d2 00 01 00 00 00 00 0a d2 00 02 00 00
        0a d2 00 00 05 69 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00
 33:    01 03 00 00 00 00 00 00 00 00
MODE SENSE[#2A]:
 2A:    1f 17 f1 77 29 23 15 a4 01 00 20 00 15 a4 00 00
        0a d2 0a d2 00 01 00 00 00 00 0a d2 00 02 00 00
        0a d2 00 00 05 69 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00
GET [CURRENT] CONFIGURATION:
 0000:  00 1b 00 00 00 1a 00 00 00 14 01 00 00 13 01 00
        00 11 00 00 00 10 00 00 00 0a 00 00 00 09 00 00
        00 08 00 00
 0001:  00 00 00 02
 0002:  00 00 00 00
 0003:  29 00 00 00
 0004:  02 00 00 00
 0010:  00 00 08 00 00 10 01 00
 001F:
 0021:  01 00 00 01 10 00 00 00
 0023:
 002F:  46 00 00 00
 0100:
 0105:
 0107:  0e 00 00 00
 0108:  41 45 37 35 32 38 46 41
 Mounted Media:         14h, DVD-RW Sequential
READ DVD STRUCTURE[#0eh]:       00 6a 00 00 01 40 d6 fd 9e d8 21 00 02 0e 08 06 
88 85 0d 00 03 4d 43 43 20 30 31 00 04 52 57 31 31 6e 39 00 05 06 88 85 0d 00 
00 00
 Media ID:              MCC 01RW11n9
 Current Write Speed:   2.0x1385=2770KB/s
 Write Speed #0:        2.0x1385=2770KB/s
 Write Speed #1:        1.0x1385=1385KB/s
GET PERFORMANCE:        00 00 00 00 00 23 10 1f 00 00 15 a4 00 00 0a d2 00 00 
00 00 00 23 10 1f 00 00 0a d2 00 00 0a d2 00 00 00 00 00 23 10 1f 00 00 15 a4 
00 00 05 69 00 00 00 00 00 23 10 1f 00 00 0a d2 00 00 05 69 
 Speed Descriptor#0:    00/2297887 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
 Speed Descriptor#1:    00/2297887 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
 Speed Descriptor#2:    00/2297887 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
 Speed Descriptor#3:    00/2297887 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
READ DVD STRUCTURE[#FF]:
 STRUCTURE#00           40:2052
 STRUCTURE#01           40:8
 STRUCTURE#02           00:2052
 STRUCTURE#03           40:192
 STRUCTURE#04           c0:2052
 STRUCTURE#05           c0:8
 STRUCTURE#06           40:24
 STRUCTURE#07           40:24580
 STRUCTURE#0c           00:30724
 STRUCTURE#0d           40:32776
 STRUCTURE#0e           40:108
 STRUCTURE#0f           c0:22
 STRUCTURE#10           40:2052
 STRUCTURE#11           00:260
 STRUCTURE#30           00:32772
 STRUCTURE#c0           c0:8
 STRUCTURE#ff           40:72
READ DVD STRUCTURE[#10h]:       32 0f 02 00 00 03 00 00 00 26 12 7f 00 00 00 00
 Media Book Type:       32h, DVD-RW book [revision 2]
 Legacy lead-out at:    2298496*2KB=4707319808
READ DVD STRUCTURE[#0h]:        32 0f 02 00 00 03 00 00 00 23 b5 3f 00 00 00 00
 Media Book Type:       32h, DVD-RW book [revision 2]
 Last border-out at:    2143552*2KB=4389994496
READ DISC INFORMATION:  00 20 11 01 02 02 02 20 00 00 00 00 00 00 00 00
 Disc status:           appendable
 Number of Sessions:    2
 State of Last Session: empty
 "Next" Track:          2
 Number of Tracks:      2
READ FORMAT CAPACITIES:
 no media:              4294770689*2048=8795690371072
 00h(800):              2297888*2048=4706074624
 10h(10):               2297888*2048=4706074624
 15h(10):               2297888*2048=4706074624
READ TRACK INFORMATION[#1]:     00 22 01 01 00 04 21 02 00 00 00 00 00 00 00 00
 Track State:           complete incremental
 Track Start Address:   0*2KB
 Free Blocks:           0*2KB
 Track Size:            2143552*2KB
 Last Recorded Address: 2143551*2KB
READ TRACK INFORMATION[#2]:     00 22 02 02 00 04 61 01 00 21 6d 50 00 21 6d 50
 Track State:           invisible incremental
 Track Start Address:   2190672*2KB
 Next Writable Address: 2190672*2KB
 Free Blocks:           107216*2KB
 Track Size:            107216*2KB
FABRICATED TOC:         18 1 1
 Track#1  :             [EMAIL PROTECTED]
 Track#AA :             [EMAIL PROTECTED]
 Multi-session Info:    [EMAIL PROTECTED]
Thanks for your work on dvd+rw-tools Andy.

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