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How fast are external enclosures suppose to be?

post #1 of 13
Thread Starter 
I just bought a WD Caviar Black 1TB 7200 RPM and put it in an NexStar CX usb 3 enclosures. The transfer speed is about 25mb/sec. Is this how fast it's suppose to be? I was expecting a lot more from usb 3.
post #2 of 13
Are you sure it is plugged into a USB 3 port? If it isn't it will transfer at USB 2 speeds.
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post #3 of 13
^^^

25 MB/s is the about the maximum for USB 2.0. That drive should deliver at least 85-100 MB/s sustained throughput on USB 3.0. You need a USB 3.0 cable to attach it as well, of course.

The NexStar CX comes in two different models. The one that says "SuperSpeed" on the side of it is USB 3.0. If it doesn't say SuperSpeed, it's the USB 2.0 model.

Greg
Edited by hammong - 6/5/13 at 9:31pm
post #4 of 13
Thread Starter 
I know for sure the cable is usb 3, and I'm also pretty sure I plugged it into the right sockets. Are there any benchmarks that I can do?
post #5 of 13
Copy a big file (like a 700 MB ISO or a video clip, etc) and Windows should tell you the transfer rate. Don't rely on small file transfers, even with USB 3.0, Windows will be slow copying a large number of small files due to write-back cache being disabled on external drives.

Greg
post #6 of 13
The USB ports on your case will be blue if they are USB3. Fill out your specs with rigbuilder so we can get a better idea of what hardware you're working with. thumb.gif
Edited by Tnt6200 - 6/5/13 at 9:44pm
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post #7 of 13
Thread Starter 
Quote:
Originally Posted by hammong View Post

Copy a big file (like a 700 MB ISO or a video clip, etc) and Windows should tell you the transfer rate. Don't rely on small file transfers, even with USB 3.0, Windows will be slow copying a large number of small files due to write-back cache being disabled on external drives.

Greg

Aha, I tried copying a 14 gig video files and it clock in at 55 mb/sec. So when I copy bunch of small files, is it faster to do them one by one than selecting them all and copying them over?
post #8 of 13
Thread Starter 
Quote:
Originally Posted by hammong View Post

^^^

25 MB/s is the about the maximum for USB 2.0. That drive should deliver at least 85-100 MB/s sustained throughput on USB 3.0. You need a USB 3.0 cable to attach it as well, of course.

The NexStar CX comes in two different models. The one that says "SuperSpeed" on the side of it is USB 3.0. If it doesn't say SuperSpeed, it's the USB 2.0 model.

Greg

It does say Superspeed. I have a Dell XPS 15Z laptop. Maybe the usb 3 on here just suck? Haven't built my own rig yet... hopefully in 2014.
post #9 of 13
That's not too bad, 55 MB/sec is well over the USB 2.0 limits - so you're definitely running USB 3.0. You're not going to see blazing USB 3.0 speeds copying from a typical laptop hard drive due to most of them being slower than their desktop counterparts. If you had an SSD in the laptop, copy speeds would probably be substantially better. 55 MB/sec might be about as fast as you can go.

As for copying small files, for backup purposes anyhow, has been to create a TAR or a low-compression ratio ZIP or 7z file with something like 7-zip. 7-zip will write one large archive file to the external drive instead of a large number of tiny files with the large amount of file system overhead that goes with it. An added advantage, for backup purposes anyway, is that the single file archive is easier to keep track or move around to more permanent storage mediums later on.

You can boost performance with the external drive by turning ON write caching and DISABLE optimization for "fast removal" and DISABLE write butter flushing in Windows. If you do, you must be diligent about ejecting the external drive before removing it, or only plug/unplugging the drive while the system is shutdown. Not worth the hassle to me unless you're copying large amounts of data routinely.

Greg
post #10 of 13
Quote:
Originally Posted by Blackninja12 View Post

I know for sure the cable is usb 3, and I'm also pretty sure I plugged it into the right sockets. Are there any benchmarks that I can do?
Quote:
Originally Posted by Blackninja12 View Post

Aha, I tried copying a 14 gig video files and it clock in at 55 mb/sec. So when I copy bunch of small files, is it faster to do them one by one than selecting them all and copying them over?

There's quite a bit of overhead involved with file copies. If you just want to find raw throughput, try running CrystalDiskMark (just uncheck the boxes for random performance or the test might take forever). It's still faster to copy small files by batch compared to doing it one by one. However, you might want to do it in smaller batches so you feel like there's progress.

For small files (source code, etc), I've taken to using an SSD (old OS drive) with a SATA to USB3 adapter. Much faster than HDD.
Edited by rui-no-onna - 6/6/13 at 1:20pm
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