External USB HD speed??

  • Thread starter Thread starter Jay Phillips
  • Start date Start date
J

Jay Phillips

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
 
Jay said:
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.
Click to expand...

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
 
Will Dormann said:
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.
Click to expand...

Nope, 480Mb/s NE 60MB/s.
In real life, I doubt you'd see anything achieving much faster than 30MB/sec.
Click to expand...

How fortunate for you that you said "doubt" in stead of "bet".
 
"Jay Phillips" said:
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.
Click to expand...

Hi,

I have some USB 2 Maxtor external HD. Copying from one to another can
get up to 18 MB / s.
 
Will Dormann said:
Read the specs.
Click to expand...

Read them yourself. Obviously you can't.
http://www.usb.org/developers/docs
Click to expand...

Specs usually don't list empyrical or real world
data, it would be quite surprising if this one did.
It's 60MB/sec.
Click to expand...

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.
 
Jay Phillips said:
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.
Click to expand...

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
 
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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