Panasonic UJ-840 DVD Writer
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What is the DVD Write speeds? CAV, CLV, PCAV, ZCLV. Read our DVD Writer colum explanation.
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CDR, DVDR, BDR, HDDVDR
|Slim EIDE, 2MB
| DVD Media
comments for this DVD Writer (click on the link to
read the comments):
1 AVB 8xDVD-R (FUJIFILM03..) comments, 0 good, 0 mixed, 1 poor.
1 Fujifilm 8xDVD-R (FUJIFILM03..) comments, 1 good, 0 mixed, 0 poor.
1 Fujifilm 8xDVD-R (ProdiscF01..) comments, 0 good, 1 mixed, 0 poor.
1 Fujifilm 8xDVD+R (RITEK...R03) comments, 0 good, 0 mixed, 1 poor.
1 Fujifilm 8xDVD+R (YUDEN000T02) comments, 1 good, 0 mixed, 0 poor.
1 Intenso 8xDVD-R (DAXON008S...) comments, 1 good, 0 mixed, 0 poor.
1 Maxell 8xDVD+R (RITEK...R03) comments, 0 good, 0 mixed, 1 poor.
1 Office Depot 4xDVD-RW (RITEKW04....) comments, 1 good, 0 mixed, 0 poor.
1 Sony 4xDVD+RW (PHILIPS.041) comments, 1 good, 0 mixed, 0 poor.
1 TDK 4xDVD+RW (PHILIPS.041) comments, 1 good, 0 mixed, 0 poor.
Post your DVD Media comments here
| Column Explanation:
Click on this for more technical information.
New comments= New comments since your last visit.
New Writer = New DVD Writer since your last vist.
Original Equipment Manufacturer.
The manufacturer of the main chipset the DVD writer/recorder is based on.
Write support / Read support
DVD-R = Works
DVD-R? = Not tested
Single Layer(4.7GB) write speeds
1x (CLV) = about 58 minutes
2x (CLV) = about 29 minutes
2.4x (CLV) = about 24 minutes
4x (CLV) = about 14.5 minutes
6x (CLV/ZCLV) = about 10-12 minutes
8x (PCAV/ZCLV) = about 8-10 minutes
12x (PCAV/ZCLV) = about 6.5-7.5 minutes
16x (CAV/ZCLV) = about 6-7 minutes
Dual/Double Layer(8.5GB) write speeds
1x CLV = about 105 minutes
2.4x CLV = about 44 minutes
4x CLV = about 27 minutes
Single Layer (4.7GB) read speeds
1x read speed is 1.321MB/s = ~56 minutes
6x CAV (avg. ~4x) read speed is max 7.93MB/s = ~14 minutes
8x CAV (avg. ~6x) read speed is max 10.57MB/s = ~10 minutes
12x CAV (avg. ~8x) read speed is max 15.85MB/s = ~7 minutes
16x CAV (avg. ~12x) read speed is max 21.13MB/s = ~5 minutes
DVD Write types
CAV = Constant Angular Velocity, the DVD is written at a constantly increasing speed.
CLV = Constant Linear Velocity, the DVD is written at a constant speed.
ZCLV = Zone Constant Linear Velocity, the DVD is divided into zones. After each zone the write speed is increased.
PCAV = Partial Constant Angular Velocity, the DVD is being written at an increasing speed until a certain speed. After this speed it will not increase anymore.
Desktop = Standalone desktop DVD Recorder
EIDE = Computer DVD Writer with EIDE/IDE connection
SCSI = Computer DVD Writer with SCSI connection
USB = Computer desktop DVD Writer with USB 2.0 or/and 1.1 connection
FireWire = Computer desktop DVD Writer with IEEE 1394/FireWire/i.Link connection (some standalone desktop dvd recorder supports this also but then it is usually to connect your DV camera to the recorder)
The first rating is based on a weighted rank (the true Bayesian), it requires at least 5 votes to get a weighted rating.
The second rating between the ( ) is a normal average rating.