USB Speed

[meow2222]

Hi


500G usb hdd connected to a P3 with USB 1 only is only managing to run
at 1,5M transfer rate, which is far too slow for the quantities of
data in use. USB1 should run happily at 12M, the question is how do I
get it to do so?

PC: P3 500, 384, DMA enabled, 98se with the nusb3.1 drivers. Onboard
usb.
HDD: WD 500G usb hdd.
USB: just the one usb device connected.


cheers,
NT

 

[Gerard Bok]

500G usb hdd connected to a P3 with USB 1 only is only managing to run
at 1,5M transfer rate, which is far too slow for the quantities of
data in use. USB1 should run happily at 12M, the question is how do I
get it to do so?

No. USB 1 is running at 12 megabit per second. You are observing
1.5 MegaByte per second. Which is more or less the same.

PC: P3 500, 384, DMA enabled, 98se with the nusb3.1 drivers. Onboard
usb.
HDD: WD 500G usb hdd.
USB: just the one usb device connected.

You could buy an USB 2.0 add in board for your PC.
Don't expect anything spectacular though.
It will still be a P3 500.

Chances are, that even an USB 2 board will run at 12 Mbps,
because the PC may be unable to cope with 480 Mbps.
And 500 GB still remains a huge amount

 

[BIC]

Hi


500G usb hdd connected to a P3 with USB 1 only is only managing to run
at 1,5M transfer rate, which is far too slow for the quantities of
data in use. USB1 should run happily at 12M, the question is how do I
get it to do so?

PC: P3 500, 384, DMA enabled, 98se with the nusb3.1 drivers. Onboard
usb.
HDD: WD 500G usb hdd.
USB: just the one usb device connected.


cheers,
NT

12mb is the max..............its like BTBroadband marketing BB as 8mb, the
in small print "up to"

why not install a USB 2.0 PCI card....then you could have 4 USB 2.0 ports

 

[Mike Walsh]

No. USB 1 is running at 12 megabit per second. You are observing
1.5 MegaByte per second. Which is more or less the same.


You could buy an USB 2.0 add in board for your PC.
Don't expect anything spectacular though.
It will still be a P3 500.

Chances are, that even an USB 2 board will run at 12 Mbps,
because the PC may be unable to cope with 480 Mbps.
And 500 GB still remains a huge amount

A USB2 card will run at 480 Mb/s in any system. A Pentium 3 can easily handle 480 Mb/s if DMA is working.

 

[kony]

No. USB 1 is running at 12 megabit per second. You are observing
1.5 MegaByte per second. Which is more or less the same.


You could buy an USB 2.0 add in board for your PC.
Don't expect anything spectacular though.
It will still be a P3 500.

That matters very little, almost not at all.
Even a Pentium 200 could achieve very near full speed from
the HDD if only it had a PCI ATA133 card installed to
connect to it.

Chances are, that even an USB 2 board will run at 12 Mbps,
because the PC may be unable to cope with 480 Mbps.
And 500 GB still remains a huge amount

If the PC has USB2, it will cope fine with the max speed
USB2 plus bridget to HDD can provide. System age/CPU
performance in this regard is not very significant, it is
not like it was PIO mode.

Regardless you're right it is a USB1 bottleneck at present,
and a USB2 card would substantially increase performance.
Even more performance would come from making this an
internal ATA-connected drive instead of USB, even if the
system only supported ATA33 it would still be a performance
increase, but even more if ATA66 or higher motherboard IDE
support is present.

 

[Gerard Bok]

A USB2 card will run at 480 Mb/s in any system. A Pentium 3 can easily handle 480 Mb/s if DMA is working.

Change 'will' to 'can' and we'll agree

 

[kony]

Change 'will' to 'can' and we'll agree

He was corrent. PCI bus is the limitation on any system of
roughly Pentium 1 100MHz or higher. CPU is not much of a
factor.

 

[meow2222]

That matters very little, almost not at all.
Even a Pentium 200 could achieve very near full speed from
the HDD if only it had a PCI ATA133 card installed to
connect to it.

If the PC has USB2, it will cope fine with the max speed
USB2 plus bridget to HDD can provide. System age/CPU
performance in this regard is not very significant, it is
not like it was PIO mode.

Regardless you're right it is a USB1 bottleneck at present,
and a USB2 card would substantially increase performance.
Even more performance would come from making this an
internal ATA-connected drive instead of USB, even if the
system only supported ATA33 it would still be a performance
increase, but even more if ATA66 or higher motherboard IDE
support is present.

Thanks everyone. I'll leave it till the machine is replaced, which
shouldnt be long. Data can transfer overnight until then.

cheers,
NT

 

[DaveW]

The 12 mbps (mega-bits per second; not the 12 mega-Bytes that you referred
to) is equal to 1.5 MBPS. USB 1.0 runs at 12 mbps or 1.5 MBPS peak rate.
Not average rate.
That is why No one uses a USB 1.0 connection for a harddrive connection.
Time for you to install a USB 2.0 card in the computer, which will run at a
PEAK rate of 480 mbps or 60 MBPS.