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Newbie
Posts: 11
Registered: ‎02-03-2015

SanDisk Extreme USB 3.0 64GB Flash Drive - slow performance

Just bought an Extreme USB 3.0 Flash Drive 64GB and copied some 3.6 GB from my Win7 PC using a USB 3.0 slot.

Felt somewhat slow, so I used H2testw to get an "independent" oppinion:

Write speed: 59 MB/s

Read speed: 72 MB/s

After 6 GB the dongle disconnected an Win aksed me to fix the drive.

Somewhat disappoining for a stick that comes at double the price of a std. USB3 stick.

Any advice?

Many thanks!

Scrambler

Newbie
Posts: 11
Registered: ‎02-03-2015

Re: SanDisk Extreme USB 3.0 64GB Flash Drive - slow performance

forgot to say:

 

package says:

"up to 245 MB/s read speed" / "190 MB/s write speed"

... far, far away from my experience... (see post above)

 

any advice highly appreciated!

SanDisk Guru
Posts: 2,834
Registered: ‎07-23-2010

Re: SanDisk Extreme USB 3.0 64GB Flash Drive - slow performance

[ Edited ]

"up to" is usually in ideal circumstances.  Nothing else running on the machine, very efficient OS, no security  apps running, lots of RAM, ligntning fast processor, perfect power, perfect room temp, etc. etc.  Obviously one or more of those items is effecting your speeds.  Security apps can play a big part of it as can dirty contacts.

Ed
Important files = Backed up files
Newbie
Posts: 11
Registered: ‎02-03-2015

Re: SanDisk Extreme USB 3.0 64GB Flash Drive - slow performance

Thanks for your quick reply, Ed!

 

You seem to spend quite some time here answering questions and helping people fixing problems - I truly believe we all highly appreciate this!

 

Back to my topic: I did suspend my virus/security SW during my tests. I watched task/mgr-resource/monitor for disk activities and there seemed to be just the test pgm accessing the drive - appart from the usual system monitoring.

Did this with both h2testw and ATTO (tried to attach a hardcopy but this reply box doesn't seem to allow).

Still I feel somewhat disappointed with the throughput.

In the end the package in the store didn't tell me to buy a Cray supercomputer to reach the specs...

 

Thanks

Scrambler

SanDisk Guru
Posts: 2,834
Registered: ‎07-23-2010

Re: SanDisk Extreme USB 3.0 64GB Flash Drive - slow performance

In the end the package in the store didn't tell me to buy a Cray supercomputer to reach the specs...

 

ah hah!!  You've pin pointed the problem.  Thank you.  Smiley Very Happy

 

 

But I agree your numbers seem low compared to the maximum possible.  Maybe someone else has better ideas.

Ed
Important files = Backed up files
Newbie
Posts: 11
Registered: ‎02-03-2015

Re: SanDisk Extreme USB 3.0 64GB Flash Drive - slow performance

again, thanks for the quick reply, Ed!

 

The problem might be related to the type of PC I'm using.

Though it supports USB 3, the internal disk data rate when copying files from/to it seems not to go above 110 MB/s.

I'm using an ASUS Notebook U53Jc, with i5 M460 processor at 2.53 GHz and 4GB RAM.

Internal Drive HW says ST 9500 325 AS.

 

Maybe too far from Cray?

Newbie
Posts: 11
Registered: ‎02-03-2015

Re: SanDisk Extreme USB 3.0 64GB Flash Drive - slow performance

the thing that really bothers me, however, is that the stick every now and then (every ~2-5 mins) disconnects and reconnects.

any explanation - or cure for this?

Newbie
Posts: 2
Registered: ‎02-04-2015

Re: SanDisk Extreme USB 3.0 64GB Flash Drive - slow performance

Hi Scrambler, i just bought a sandisk extreme and i just opened it. Having very slow speeds as u are. read : 70mb/s and write: 45-50mb/s. I am very very disappointed with the product.

Newbie
Posts: 11
Registered: ‎02-03-2015

Re: SanDisk Extreme USB 3.0 64GB Flash Drive - slow performance

do you get any of those erratical dis-/reconnects, too?

Newbie
Posts: 2
Registered: ‎02-04-2015

Re: SanDisk Extreme USB 3.0 64GB Flash Drive - slow performance

nope not any of those...crystal mark shows 240mb/s speed. But i cannot see them in actual file transfer. Tried all possiblities...no fix yet.