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External USB HD speed??

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  • External USB
  • Storage
Last response: in Storage
Anonymous
a b G Storage
April 25, 2004 1:36:36 PM

Archived from groups: comp.sys.ibm.pc.hardware.storage (More info?)

Hello All, just picked up a SimpleTech 160 GB 7200rpm USB 2.0 External. I'm
getting about 11MB transfer rate. I DO have a 2.0 card. What is the deal
with USB transfer rates? I didn't expect to see 480MB, but I did expect to
see something faster than this. I have a pretty speedy AMD 3000+ tweaked
system.

Thanks
J

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More about : external usb speed

Anonymous
a b G Storage
April 25, 2004 7:46:42 PM

Archived from groups: comp.sys.ibm.pc.hardware.storage (More info?)

Jay Phillips wrote:

> Hello All, just picked up a SimpleTech 160 GB 7200rpm USB 2.0 External. I'm
> getting about 11MB transfer rate. I DO have a 2.0 card. What is the deal
> with USB transfer rates? I didn't expect to see 480MB, but I did expect to
> see something faster than this. I have a pretty speedy AMD 3000+ tweaked
> system.

11MB/sec is a bit on the slow end for a USB 2.0 drive, but it's not out
of the question. It's definately faster than anything you could
achieve with USB 1.x.

The max theoretical speed of USB 2.0 is 480Mb/sec, which would equal
60MB/sec. In real life, I doubt you'd see anything achieving much
faster than 30MB/sec.


-WD
Anonymous
a b G Storage
April 26, 2004 5:12:37 AM

Archived from groups: comp.sys.ibm.pc.hardware.storage (More info?)

"Will Dormann" <wdormann@yahoo.com.invalid> wrote in message news:C3Ric.13390$3_1.5971@fe2.columbus.rr.com...
> Jay Phillips wrote:
>
> > Hello All, just picked up a SimpleTech 160 GB 7200rpm USB 2.0 External. I'm
> > getting about 11MB transfer rate. I DO have a 2.0 card. What is the deal
> > with USB transfer rates? I didn't expect to see 480MB, but I did expect to
> > see something faster than this. I have a pretty speedy AMD 3000+ tweaked
> > system.
>
> 11MB/sec is a bit on the slow end for a USB 2.0 drive, but it's not out
> of the question. It's definately faster than anything you could
> achieve with USB 1.x.
>
> The max theoretical speed of USB 2.0 is 480Mb/sec, which would equal
> 60MB/sec.

Nope, 480Mb/s NE 60MB/s.

> In real life, I doubt you'd see anything achieving much faster than 30MB/sec.

How fortunate for you that you said "doubt" in stead of "bet".

>
>
> -WD
Related resources
Anonymous
a b G Storage
April 26, 2004 5:12:38 AM

Archived from groups: comp.sys.ibm.pc.hardware.storage (More info?)

Folkert Rienstra wrote:

> "Will Dormann" <wdormann@yahoo.com.invalid> wrote in message news:C3Ric.13390$3_1.5971@fe2.columbus.rr.com...
>
>>The max theoretical speed of USB 2.0 is 480Mb/sec, which would equal
>>60MB/sec.
>
>
> Nope, 480Mb/s NE 60MB/s.


Read the specs.
http://www.usb.org/developers/docs

It's 60MB/sec.


-WD
Anonymous
a b G Storage
April 26, 2004 8:11:32 PM

Archived from groups: comp.sys.ibm.pc.hardware.storage (More info?)

In article <RpudnS3yeO14IxbdRVn-jg@comcast.com>, "Jay Phillips"
<@shooter@writeme.com> says...
> Hello All, just picked up a SimpleTech 160 GB 7200rpm USB 2.0 External. I'm
> getting about 11MB transfer rate. I DO have a 2.0 card. What is the deal
> with USB transfer rates? I didn't expect to see 480MB, but I did expect to
> see something faster than this. I have a pretty speedy AMD 3000+ tweaked
> system.

Hi,

I have some USB 2 Maxtor external HD. Copying from one to another can
get up to 18 MB / s.

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ICQ# 114297372
Anonymous
a b G Storage
April 26, 2004 8:57:04 PM

Archived from groups: comp.sys.ibm.pc.hardware.storage (More info?)

"Will Dormann" <wdormann@yahoo.com.invalid> wrote in message news:FLYic.14737$3_1.346@fe2.columbus.rr.com...
> Folkert Rienstra wrote:
>
> > "Will Dormann" <wdormann@yahoo.com.invalid> wrote in message news:C3Ric.13390$3_1.5971@fe2.columbus.rr.com...
> >
> > > The max theoretical speed of USB 2.0 is 480Mb/sec, which
> > > would equal 60MB/sec.
> >
> >
> > Nope, 480Mb/s NE 60MB/s.
>
>
> Read the specs.

Read them yourself. Obviously you can't.

> http://www.usb.org/developers/docs

Specs usually don't list empyrical or real world
data, it would be quite surprising if this one did.

>
> It's 60MB/sec.

Which obviously includes all protocol and command overhead.
User available data rate as measured by benchmarks will be
much less than that.

This has been told many times but you are totally incapable
of 'getting a clue', aren't you Will.

The thread "Serial ATA: Is it 1.5Gbps or 150MBps?"
wooshed right by you:

"SATA is currently 150MB/sec. 1.5Gb/sec is just wrong."

And that 1.5Gb/sec even *was* in the specs for everyone to read.


>
>
> -WD
Anonymous
a b G Storage
April 26, 2004 8:57:11 PM

Archived from groups: comp.sys.ibm.pc.hardware.storage (More info?)

"Jay Phillips" <@shooter@writeme.com> wrote in message
news:RpudnS3yeO14IxbdRVn-jg@comcast.com...
> Hello All, just picked up a SimpleTech 160 GB 7200rpm USB 2.0 External.
I'm
> getting about 11MB transfer rate. I DO have a 2.0 card. What is the deal
> with USB transfer rates? I didn't expect to see 480MB, but I did expect to
> see something faster than this. I have a pretty speedy AMD 3000+ tweaked
> system.
>

For info...

SiSoft Sandra says this about my USB 2.0 drive which is a WD 120 GByte
8MByte cache model.
(My USB 2.0 port is provided by a PCI card using the NEC chip)

All are MByte/s...

Buffered Read 17
Sequential Read 14
Random Read 4

Buffered Write 14
Sequential Write 14
Random Write 8
Anonymous
a b G Storage
April 27, 2004 4:07:36 AM

Archived from groups: comp.sys.ibm.pc.hardware.storage (More info?)

Thanks for all the input guys..I'm getting about 12 to 14MB's now (don't
know why it peaked) I guess it's not bad for $128.00..It will serve my
purpose..

Peace
J

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"CWatters" <colin.watters@pandoraBOX.be> wrote in message
news:Hbbjc.87185$bm1.5624882@phobos.telenet-ops.be...
>
> "Jay Phillips" <@shooter@writeme.com> wrote in message
> news:RpudnS3yeO14IxbdRVn-jg@comcast.com...
> > Hello All, just picked up a SimpleTech 160 GB 7200rpm USB 2.0 External.
> I'm
> > getting about 11MB transfer rate. I DO have a 2.0 card. What is the deal
> > with USB transfer rates? I didn't expect to see 480MB, but I did expect
to
> > see something faster than this. I have a pretty speedy AMD 3000+ tweaked
> > system.
> >
>
> For info...
>
> SiSoft Sandra says this about my USB 2.0 drive which is a WD 120 GByte
> 8MByte cache model.
> (My USB 2.0 port is provided by a PCI card using the NEC chip)
>
> All are MByte/s...
>
> Buffered Read 17
> Sequential Read 14
> Random Read 4
>
> Buffered Write 14
> Sequential Write 14
> Random Write 8
>
>
>