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Old April 20th, 2009, 03:54 PM   #1
Major Player
Join Date: Nov 2008
Location: Santa Monica, CA
Posts: 318
What dictates transfer speeds?

I had this post on another thread but haven't had a response yet. below you will notice some transfer tests i performed last week and the results were alarming to me. basically i'm wondering what components dictate fast transfer speeds? ie: processor speed, interface connection, and/or hard drive speed? i kind of already know the answer from analyzing my test results, but i guess i just want some conformation.

here was my test:

ok, i just performed some tests and the results are unbelievable/confusing. i used a 16GB SxS card filled exactly to 8.0GB of footage with about 30-1 minute clips. Two different computers were used. MacBook Pro circa 2007 and a Dell desktop with the Sony USB reader. with the MBP I used a Western Digital 500GB 7200rpm FW800 external HDD as well as the internal HDD. here are the results.

MacBook Pro
2.33GHz Intel Core Duo
150GB 5400rpm HDD

using Clip Browser version 1 with ExpressCard slot:
8GB-MBP= 6:30 minutes
MBP HDD-WD HDD= <10 minutes
8GB-WD HDD= <8 minutes

Drag & Drop method with ExpressCard slot:
8GB-MBP= 5 minutes
MBP-WD HDD= 4:50 minutes
8GB-WD HDD= 4:10 minutes

Dell desktop
2.4GHz Intel Core 2 Quad
500GB 7200rpm HDD

using Clip Browser version 2.5 with Sony USB reader:
8GB-Dell= 5:30 minutes
8GB-Dell= 10 minutes with Data Protection & CRC turned on

using Clip Browser version 1 with Sony USB reader:
8GB-Dell= 5:15 minutes

Drag & Drop with Sony USB reader:
8GB-Dell= 4:45 minutes

so, what i found confusing was that my Dell with a USB reader was faster then a MBP with an ExpressCard slot. my results tell me that its not so much the interface/connection you use to dump/transfer footage its the processors and/or hard drive speeds that determine quick transfer times.

am i wrong or right?

Michael B. McGee is offline   Reply With Quote
Old April 20th, 2009, 07:31 PM   #2
Major Player
Join Date: Nov 2006
Location: Brisbane, California
Posts: 529
The speed and sometimes the interface of the destination drive has a lot to do with the transfer speed, perhaps more so than processor speed.

When I transfer from my MacBook Pro SxS expresscard slot to a NAS Gigabit Ethernet RAID I've seen up to 70MB/second transfer speed. The NAS is just an old Powerbook G4 with Gigabit ethernet and attached via a Firewire 800 but the RAID is fast.

Going to my Drobo with similar setup I max out at 20MB/second, though it has a FW800 interface as well.

Probably if you did some tests with some disk benchmarking software you'd find similar results.
Keith Moreau is offline   Reply

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