GoFlex speed fluctuation

[Mr Dobey]

GoFlex Thin USB 3.0 to Retina MacBook Pro. Formated as Mac OS Extended (Journaled)

Why would the read speed fluctuate so consistently?

 

[carestudio]

does the spotlight index the files on the background?

 

[Mr Dobey]

I would think indexing would go on after the file has been completely transferred. But I did try to check by transferring another file. As I remember in previous Mac OS' you would click on the top right hand corner magnifying glass to see when indexing was happening. I don't see anything under 10.8.2. Do you know how to check?

 

[quasinormal]

I get a consistent 48 MB/s using a Goflex attached to both FireWire and Thunderbolt.

 

[Mr Dobey]

I get a consistent 48 MB/s using a Goflex attached to both FireWire and Thunderbolt.

Do you have an SSD in your computer?

 

[quasinormal]

Do you have an SSD in your computer?

A 512gb Samsung 830 in a 15" early 2011 and a 5400rpm 750gb in a 13" early 2011. I just remembered I was copying to another Samsung 512gb via a goflex fw800 adapter for the 13" 48MB a sec reading. Backing files up from a fw800 goflex to thunderbolt 2.5" goflex ( both 1.5TB) I still get a consistent 48MB a sec.

 

[Mr Dobey]

If you're getting a constant speed I wonder if it has to do with the USB 3.0 controller in the GoFlex Thin.

 

[carestudio]

how full is your drive now? I guess it's just a slower drive (hard disk) when it gets full. I am still awaiting for CalDigit T1 SSD thunderbolt drives that can reach 470MB/s , the regular drive would not get you sustain data rate while it gets full or over some % of usage.

 

[sjinsjca]

GoFlex Thin USB 3.0 to Retina MacBook Pro. Formated as Mac OS Extended (Journaled)

Why would the read speed fluctuate so consistently?

Buffering behavior. Pipe is faster than the mechanical drive.

 

[Mr Dobey]

Buffering behavior. Pipe is faster than the mechanical drive.

Brilliant.

 

[Mr Dobey]

I get the same fluctuation with my USB 2.0 Blu-Ray drive.
In my case it's the drive's 4x (144Mb/s) read speed.

Looks like this behavior is common as I read here.
vhttp://www.tomshardware.com/reviews/external-blu-ray-burner,2999-10.html