External USB20 HDD writing speed?

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Pvest

I have a Maxtor 300Gb USB 2.0 harddrive and when I did a benchmark (with FreshDevise), it gave med this speed:

Write 1.1 Mb/s,

Read 60.5Mb/s speed.

I also know that the spec for USB2.0 480Mbps, but not really sure how to read different benchmark speed I get!?

But can anybody confirm that a USB 2.0 writing-speed on 1.1Mb/s is what I could expect, or is there anything wrong here??



Pvest
 
I have a Maxtor 300Gb USB 2.0 harddrive and when I did a benchmark (with
FreshDevise), it gave med this speed:

Write 1.1 Mb/s,

Read 60.5Mb/s speed.

I also know that the spec for USB2.0 480Mbps, but not really sure how to
read different benchmark speed I get!?

But can anybody confirm that a USB 2.0 writing-speed on 1.1Mb/s is what I
could expect, or is there anything wrong here??
Pvest


Pvest:
While the following doesn't directly answer your query, you may be
interested in some tests we did earlier this year. Our interest was in
"real-life" scenarios, i.e., data transfer rate between a PC's HD and the
USB device.

We ran some speed tests (copying data from the HD to USB devices and vice
versa) using a variety of flash drive 512 MB & 1 GB models and a number of
minidrives between 4 GB - 8 GB. Two desktop medium-powered PCs were used in
the tests. All devices were USB 2.0.

The "test" involved copying 1 GB of data - 12 folders comprising 503 files -
(500 MB of data where 512 MB flash drives were involved) between internal
hard drives and the USB devices. The results were as follows - all averages
with roughly a 5% - 10% differential between different models of the same
capacity.

Flash drive
Copying from HD to flash drive -- 200 MB/min
" " flash drive to HD -- 250 MB/min

Minidrives
Copying from HD to minidrive -- 430 MB/min
" " minidrive to HD -- 500 MB/min

Considerably faster with minidrives.

Copying from HD to USB external hard drive - 680 MB/min (the data transfer
rate was much wider where USB EHDs were involved - ranging between 650
MB/min to 800 MB/min, although in most cases the average was slightly under
700 MB/min). We did not time test from the USB device to the internal HD.
Anna
 
480 Mbps is mega bits per second; 8 bits equal a byte, so 60
MB/sec is right, but write speed depends on the connection,
the overhead, the antivirus may be scanning on writes, etc.

You're getting full USB 2.0 reads, but the writes are slow,
many things can be causing this.



|
| I have a Maxtor 300Gb USB 2.0 harddrive and when I did a
benchmark (with
| FreshDevise), it gave med this speed:
|
| Write 1.1 Mb/s,
|
| Read 60.5Mb/s speed.
|
| I also know that the spec for USB2.0 480Mbps, but not
really sure how to
| read different benchmark speed I get!?
|
| But can anybody confirm that a USB 2.0 writing-speed on
1.1Mb/s is what I
| could expect, or is there anything wrong here??
| Pvest
|
|
| Pvest:
| While the following doesn't directly answer your query,
you may be
| interested in some tests we did earlier this year. Our
interest was in
| "real-life" scenarios, i.e., data transfer rate between a
PC's HD and the
| USB device.
|
| We ran some speed tests (copying data from the HD to USB
devices and vice
| versa) using a variety of flash drive 512 MB & 1 GB models
and a number of
| minidrives between 4 GB - 8 GB. Two desktop medium-powered
PCs were used in
| the tests. All devices were USB 2.0.
|
| The "test" involved copying 1 GB of data - 12 folders
comprising 503 files -
| (500 MB of data where 512 MB flash drives were involved)
between internal
| hard drives and the USB devices. The results were as
follows - all averages
| with roughly a 5% - 10% differential between different
models of the same
| capacity.
|
| Flash drive
| Copying from HD to flash drive -- 200 MB/min
| " " flash drive to HD -- 250 MB/min
|
| Minidrives
| Copying from HD to minidrive -- 430 MB/min
| " " minidrive to HD -- 500 MB/min
|
| Considerably faster with minidrives.
|
| Copying from HD to USB external hard drive - 680 MB/min
(the data transfer
| rate was much wider where USB EHDs were involved - ranging
between 650
| MB/min to 800 MB/min, although in most cases the average
was slightly under
| 700 MB/min). We did not time test from the USB device to
the internal HD.
| Anna
|
|
 
I have a Maxtor 300Gb USB 2.0 harddrive and when I did a benchmark (with FreshDevise), it gave med this speed:

Write 1.1 Mb/s,

Read 60.5Mb/s speed.

I also know that the spec for USB2.0 480Mbps, but not really sure how to read different benchmark speed I get!?

But can anybody confirm that a USB 2.0 writing-speed on 1.1Mb/s is what I could expect, or is there anything wrong here??
Click to expand...

Something's very wrong.
 
Loren Pechtel said:
Something's very wrong.
Click to expand...


At 300 GB capacity, I'm going to assumt it is a full out 3.5" drive.

if it is an IDE drive inside, it should run at 500 MB/s, SATA-I runs at 1.5
GB/s, and (in your case the most likely) SATA-II runs at 3.0 GB/s. Take note
these are maximum data rates for the HDD ONLY.

Going through USB 2.0, the maximum is 480 Mbps or MegaBITS per second, not
megaBYTES per second. The data transfer rate is different than the transfer
rate of the hard drives.

There are 8 bits in a byte. So, at 480 megaBITS per second translates into
approximately 60 megaBYTES per second (Divide by 8).

So, although your write speed does seem a little slow, for an exterenal
drive, your read speed sounds like it's on par. Your speed cap is caused by
the USB transfer rate and not the Hard drive.
 
At 300 GB capacity, I'm going to assumt it is a full out 3.5" drive.

if it is an IDE drive inside, it should run at 500 MB/s, SATA-I runs at
1.5 GB/s, and (in your case the most likely) SATA-II runs at 3.0 GB/s.
Take note these are maximum data rates for the HDD ONLY.

Going through USB 2.0, the maximum is 480 Mbps or MegaBITS per second, not
megaBYTES per second. The data transfer rate is different than the
transfer rate of the hard drives.

There are 8 bits in a byte. So, at 480 megaBITS per second translates into
approximately 60 megaBYTES per second (Divide by 8).

So, although your write speed does seem a little slow, for an exterenal
drive, your read speed sounds like it's on par. Your speed cap is caused
by the USB transfer rate and not the Hard drive.



--
Lawrence Wong
Computer Systems & Networking Technology Student
Centennial College, School of Science & Technology
Toronto, Ontario, Canada
Click to expand...


A small correction: EIDE drives can run at a maximum transfer rate of 133
MB/s, not 500.
 
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