He is right both the sonic and matric are shop4tech brands and I skipped the sonic and ordered the matrix which is a little higher and they still are not that good. I could only burn 4x disk at 2x and even with that they sometimes stop during the play of the movie and also would not play on all players. I went to there prodisc 8x that has azo dye and have been able to burn 8x at 12x without any stopping and they play on all the players I have tried. shop4tech has the 8x prodisc with the azo dye but they also have other prodisc 8x that are a few cents cheaper and do not have the azo dye. I checked at some of the other sites listed and most did not say if the disk were the prodisc with the azo dye.
sure wish sites would list the Mfrg code for all there disk so you could tell what you are getting. This is the ones I order from shop4tech and they came in wrappers that just said dvr-r 4.7gb and did not say they were prodisc.
I ran dvdinfo on them and this is what it said.
Speaking from experence I would stay away from shop4tech cheap brands since for a few cents more they will sell you a name brand.
Region information N/A not a DVD-VIDEO
Media code/Manufacturer ID ProdiscF01
Format Capacity Blank Disc
Free Blocks 411107328
Free Capacity 4.38GB(4.71GB)
Book Type DVD-R
Media Type DVD-R
Manufacturer Rated Speed Unknown
Available Write Descriptor CLV 8.0x 11080KBps
Available Write Descriptor CLV 6.0x 8310KBps
Available Write Descriptor CLV 4.0x 5540KBps
Write Strategy Speed 4.0x 5540KBps
2x Speed OPC beta 09
2x Speed OPC power 0F
2x Write Strategy field 1 10 88 78 90
2x Write Strategy field 2 29 82 10 21 00 00
4x Speed OPC beta 05
4x Speed OPC power 17
4x Write Strategy field 1 0D 0F 07 07
4x Write Strategy field 2 96 06 0D 0B
4x Write Strategy field 3 80 00 00 00
4x Speed OPC beta multi-pulse 05
4x Speed OPC power multi-pulse 1A
4x Write Strategy field 4 17 96 77 75
4x Write Strategy field 5 7C DF B9 93 11 11
4x Write Strategy field 6 1A AA D0 00 00
Data area starting sector 30000h
Linear Density 0.267um/bit
Track Density 0.74um/track
Number of Layers 1
Complete Media Code
00000000 00 6C 00 00 01 40 C1 FD 9E D8 52 00 02 88 0D 0C .l...@....R.....
00000010 88 88 90 00 03 50 72 6F 64 69 73 00 04 63 46 30 .....Prodis..cF0
00000020 31 00 00 00 05 B8 83 00 30 00 01 00 06 09 0F 10 1.......0.......