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Slow Burn Speeds With External Burner


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#1 productofyoursinz01

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Posted 28 September 2007 - 03:12 AM

i recently got a Philips SPD3600CC 20x external usb dvd burner. I enabled nero to show the ACTUAL burn speed instead of the selected burn speed. the burner will get to 9.5x then it will start slowing down and stay at 7.9x. I am using tdk 16x dvd-r media. It takes about 7 minutes for the dvd to burn. Is it just me, or is this product defective? Any input appreciated.
is this just a case of bad dvd media? should i get dvd+r instead

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#2 Budapest

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Posted 28 September 2007 - 03:35 AM

Hello productofyoursinz01 and :thumbsup: to Bleeping Computer.

The slow speed may be due to the fact that USB 2.0 connections are generally slower than an IDE/ATA connection.
The power of accurate observation is commonly called cynicism by those who haven't got it.

—George Bernard Shaw

#3 DaChew

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Posted 28 September 2007 - 04:13 AM

You are lucky to get much over 15-17 MB/s with usb2, most of the chipsets in enclosures and computers don't work that well,
usb is a system resource hog as I/O is handled by the cpu

tdk quality has fallen since they quit using taiyo yuden to make their disks, most newer dvd burners will slow the burn down on poorer media in an attempt to get a good burn

http://www.storageupdates.philips.com/en/external.html

phillips released a new firmware about 2 weeks ago

You might try verbatim disks, preferable made in tawain, for dual layer also
Chewy

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#4 productofyoursinz01

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Posted 28 September 2007 - 02:26 PM

someone told me that at 1x it should equal 120 minutes burn time. so, therefore if i am burning in 7 minutes than i am actually writing at 17x. is this true? if so, why the miscalculation from nero? thnx

#5 DaChew

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Posted 28 September 2007 - 05:21 PM

they misinformed you, dvd burn speed is 22MB/s for 16x, 11MB/s for 8x and 5.5MB/s for 4x

now consider that the disk is spinning at constant velocity so the inner parts are moving much slower accross the laser

so even at 16x the real burn speed will be 7-8x at the start

1x would take an hour and you might have 2 hours of video on the disk

you don't seem to understand the math or concepts
Chewy

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#6 productofyoursinz01

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Posted 28 September 2007 - 09:04 PM

im just trying to find out if the product is defective or not. it takes abou 7 minutes to burn a 16x disc. is this right?

#7 DaChew

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Posted 28 September 2007 - 09:50 PM

dvd burning is quite complicated, you need better media, a good burner with recent firmware, when you throw in usb2
it's another variable.

I usually reccomend people burn at 4x in ~15 minutes with a usb burner. If yours burns fine at 8X then be happy.

Doesn't matter how fast it says it goes, the speed limit is just above 8x, firewire is usually faster. The prolific chipset usb enclosures seem to reach almost to 16X with some computers.

My fastest burn was with a internal old lg4163B was 5:19, your burner as an internal would probably do a full disk in 4:30 if the blank was good

Edited by DaChew, 28 September 2007 - 09:53 PM.

Chewy

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#8 productofyoursinz01

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Posted 28 September 2007 - 10:27 PM

thank you that was the answer i was looking for




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