Panasonic UJ-845 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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Panasonic UJ-845


OEM:
Panasonic
Chipset:N/A
24xCDR ZCLV
16xCDRW ZCLV
8xDVD-R ZCLV
4xDVD-RW ZCLV
DVD-RDL
8xDVD+R ZCLV
4xDVD+RW ZCLV
2.4xDVD+RDL CLV
5xDVD-RAM ZCLV
BD-R
BD-RE
BD-R DL
BD-RE DL
HDDVD-R
HDDVD-RW
HDDVD-RDL
HDDVD-RWDL
HDDVD-RAM
24xCD
8xDVD
BDROM
HDDVD
Slim EIDE, Slot-in, 2MB
More info
$200 8.3/10
3 votes
Read 3
comments

(16144 views)

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DVD Media comments for this DVD Writer (click on the link to read the comments):
1 Fujifilm 8xDVD-R (FUJIFILM03..) comments, 1 good, 0 mixed, 0 poor.
1 GQ (Great Quality) 16xDVD-R (ISSM R02) comments, 0 good, 0 mixed, 1 poor.
1 Maxell 2xDVD-RW (MCC 01RW11n9) comments, 0 good, 0 mixed, 1 poor.
1 Sony 16xDVD-R (SONY16D1....) comments, 1 good, 0 mixed, 0 poor.
1 TDK 16xDVD+R (CMC MAG.M01) comments, 1 good, 0 mixed, 0 poor.
1 TDK ScratchProof 8xDVD-R (TTH01.......) comments, 1 good, 0 mixed, 0 poor.
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Comments
3 comments, Showing 1 to 3 comments
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Used as a drop-in replacement for the dead CDRW in my Apple iBook G4. Works flawlessly.


Comments posted by burzum from United States, April 04, 2007. Rated this writer 10 of 10.





Excellent dual-layer drive. Not tolerate of cheap media. It hates Memorex and Maxell media, but loves Sony and Verbatim.


Comments posted by Dalbot from Canada, June 07, 2006. Rated this writer 8 of 10.





I've has this DVD writer in my laptop for 2 weeks now, works fine, BUT: programs like AnyDVD and DVD Region Free don't work with this drive (or at least with 65 percent of protected DVD movies), so if you wan't to copy protected DVD's using AnyDVD or DVD Region Free, don't buy this drive. Both my Plextor PX708A and Sony DRU710UL drive work fine with these programs...


Comments posted by Abbe from Netherlands, November 29, 2005. Rated this writer 7 of 10.




3 comments, Showing 1 to 3 comments
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1 DVD Writer hits, Showing 1 to 1 DVD Writers
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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.

OEM
Original Equipment Manufacturer.


Chipset

The manufacturer of the main chipset the DVD writer/recorder is based on.


Write support / Read support
DVD-R
= Works
DVD-R = Is not supported
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.


Connection
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)


Rating
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.


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