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Old 11-12-2010, 12:50 AM
 
24,503 posts, read 35,958,754 times
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Quote:
Originally Posted by Konraden View Post
I suspect your computer must have been caching some of that. Firewire is a streaming protocol versus USBs burst transmission rates. I goofed. USB is 12 Megabits, 2.0 is 480 Mbps.
You goofed again.

USB: 1.5 mbit/s
USB 1.1: 12 mbit/s
USB 2.0: 480 mbit/s

It's all good though.
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Old 11-12-2010, 10:28 AM
 
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File Copy Performance to USB Drive Oscillating Between Fast and Slow | sepago

"Finally, after googling around fruitlessly, I checked the external hard disks' properties in device manager. Interestingly, the write cache was disabled. This is on the "Policies" tab, where I changed the setting from "Optimize for quick removal" to "Optimize for performance". A reboot later the oscillations were gone. With the write cache enabled, the transfer rate settled at about 16 MB/s."
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Old 11-12-2010, 01:18 PM
 
Location: Wicker Park, Chicago
4,791 posts, read 13,327,120 times
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Well, using RichCopy the copying process didn't seem faster. But it seemed like a better copying method than cut n paste when the copy operation ran into errors. Maybe my Hitachi is going bad already, - sometimes it's just real slow.
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Old 11-12-2010, 01:45 PM
 
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Quote:
Originally Posted by Jesse69 View Post
Well, using RichCopy the copying process didn't seem faster. But it seemed like a better copying method than cut n paste when the copy operation ran into errors. Maybe my Hitachi is going bad already, - sometimes it's just real slow.
Run HD Tach on it and post the results

HdTach (http://www.simplisoftware.com/Public/index.php?request=HdTach - broken link)
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Old 11-12-2010, 02:23 PM
 
9,198 posts, read 22,160,372 times
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Is "copy and paste" a slower process than directly copying files from one drive to the other? Seems to me like it would be, but perhaps in the background the computer ends up doing the same thing in either operation (i.e., moving file into memory (copy) and writing file to disk (paste). Doing a copy and paste on a huge batch of files seems to me like it would be extremely slow in any environment because the copy function itself would involve a lot of disk caching before writing the files to the USB drive.
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Old 11-12-2010, 03:38 PM
 
1,441 posts, read 2,571,368 times
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Quote:
Originally Posted by Tek_Freek View Post
File Copy Performance to USB Drive Oscillating Between Fast and Slow | sepago

"Finally, after googling around fruitlessly, I checked the external hard disks' properties in device manager. Interestingly, the write cache was disabled. This is on the "Policies" tab, where I changed the setting from "Optimize for quick removal" to "Optimize for performance". A reboot later the oscillations were gone. With the write cache enabled, the transfer rate settled at about 16 MB/s."
I just tried this, transfer time was about the same, I got more oscillation with the write cache enabled than with out.

I transferred a 38GB folder containing 531 files to a usb hardrive.
With write cache disabled, transfer took 29 minutes and transfer rate was steady the whole time at 22-23MB/s

With write cache enabled, transfer time took 27 minutes. It started off fast, but steadily declined. Fastest transfer rate was at 92 MB/s and steadily declined until settling in around 23.7 MB/s about 60% into the transfer.

Transfer done just using Windows copy and paste method.
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Old 11-12-2010, 04:08 PM
 
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I know this goes without saying, but you may want to see if your motherboard/computer has updated USB drivers to see if that's an issue.
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Old 11-12-2010, 11:34 PM
 
422 posts, read 651,997 times
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Quote:
Originally Posted by Jesse69 View Post
Oh yeah, my mistake - it's a 2 TB Hitachi drive. I'm copying 13,830 items [mostly pdf] from my hd to the Hitachi, and it's getting slower as time goes by. Now it's at 791 kb/sec - 9151 items to go.
A 2 TB drive and it's USB? Seems like a drive that new would be eSATA. I never bought USB drives anyway, because I knew about how slow they were. I don't use external drives, but if I did, they would be eSATA.
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Old 11-13-2010, 12:09 AM
 
11,715 posts, read 36,332,431 times
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Quote:
Originally Posted by dougstech View Post
A 2 TB drive and it's USB? Seems like a drive that new would be eSATA. I never bought USB drives anyway, because I knew about how slow they were. I don't use external drives, but if I did, they would be eSATA.
USB is the far more common interface for external drives. Every computer made in the last decade+ has USB. eSATA has only been catching on in the last couple of years and even then its not universal.
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Old 11-13-2010, 12:19 AM
 
24,503 posts, read 35,958,754 times
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Quote:
Originally Posted by EscapeCalifornia View Post
USB is the far more common interface for external drives. Every computer made in the last decade+ has USB. eSATA has only been catching on in the last couple of years and even then its not universal.
That's true, but as I had stated earlier, the OP has a pretty decked out modern computer, and appears technically aware (has a QNAP). An eSATA would have been a no brainer here. And eSATA is universal on all modern computers.
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