We're trying to backup to an external USB 2.0 drive but
the rate is much slower (approx. 50 MB/sec.) than rated
for USB 2.0 (400 MB/sec.).

Thanks for any input you may have!

Bob H.

You can't go faster than the speed of the hard disk which is guaranteed to be less than
400MB/s.

USB 2.0 400MB/s is the speed of the pipe. That doesn't mean the device will use all of that
pipe.

Dave





"Bob H." <(E-Mail Removed)> wrote in message
news:482201c4735f$a7870e70$(E-Mail Removed)...
| We're trying to backup to an external USB 2.0 drive but
| the rate is much slower (approx. 50 MB/sec.) than rated
| for USB 2.0 (400 MB/sec.).
|
| Thanks for any input you may have!
|
| Bob H.
|

Dear,
I also have the same issue, but the harddisk's RPM is very
fast(720rpm), when we take this Harddisk and connect to
another pc(not as usb as IDE) and tried the backup, it is
much faster.
Any suggestions.

Regards
Anver
>-----Original Message-----
>You can't go faster than the speed of the hard disk which
is guaranteed to be less than
>400MB/s.
>
>USB 2.0 400MB/s is the speed of the pipe. That doesn't
mean the device will use all of that
>pipe.
>
>Dave
>
>
>
>
>
>"Bob H." <(E-Mail Removed)> wrote in
message
>news:482201c4735f$a7870e70$(E-Mail Removed)...
>| We're trying to backup to an external USB 2.0 drive but
>| the rate is much slower (approx. 50 MB/sec.) than rated
>| for USB 2.0 (400 MB/sec.).
>|
>| Thanks for any input you may have!
>|
>| Bob H.
>|
>
>
>.
>

Common speeds of disk rotation are; 4,800, 5,600, 7,200, 10,000 and 15,000rpm. This will
affect the transfer rate of the hard disk as is can be stated "the faster the disk rotation
is the higher the transfer rate can be." However, there are numerous other factors that can
affect the overall performance of a hard disk once placed in a computer (system).
This can be, but not limited to....

PCI/IDE chip-set
DMA mode
PIO mode
OS
OS drivers for the PCI/IDE chip-set
BIOS of platform

Dave




"anver" <(E-Mail Removed)> wrote in message
news:49da01c47393$87153fc0$(E-Mail Removed)...
| Dear,
| I also have the same issue, but the harddisk's RPM is very
| fast(720rpm), when we take this Harddisk and connect to
| another pc(not as usb as IDE) and tried the backup, it is
| much faster.
| Any suggestions.
|
| Regards
| Anver
| >-----Original Message-----
| >You can't go faster than the speed of the hard disk which
| is guaranteed to be less than
| >400MB/s.
| >
| >USB 2.0 400MB/s is the speed of the pipe. That doesn't
| mean the device will use all of that
| >pipe.
| >
| >Dave
| >
| >
| >
| >
| >
| >"Bob H." <(E-Mail Removed)> wrote in
| message
| >news:482201c4735f$a7870e70$(E-Mail Removed)...
| >| We're trying to backup to an external USB 2.0 drive but
| >| the rate is much slower (approx. 50 MB/sec.) than rated
| >| for USB 2.0 (400 MB/sec.).
| >|
| >| Thanks for any input you may have!
| >|
| >| Bob H.
| >|
| >
| >
| >.
| >