PDA

View Full Version : Extrnal USB drive fast enough?



dwc
2005-11-11, 16:23
I just want to make sure using one of these external IDE to USB 2.0 converters is going to be fast enough. I expect it is, but just wanted feedback in case not.

Thanks,
Dan

this is the one I've ordered:
http://www.newegg.com/Product/Product.asp?Item=N82E16817145131

Michaelwagner
2005-11-11, 17:05
I just want to make sure using one of these external IDE to USB 2.0 converters is going to be fast enough.

I have not used this one, so I can't comment on it specifically.

But in general, USB 2 hard disks are plenty fast enough to stream music for one to several clients. If you were serving 40 clients, I wouldn't recommend it. A built-in hard disk is faster. But for the "normal" home use of one to several clients, it's fine.

Where USB disks show their speed a bit is when you first scan your library of music. Scan isn't fast anyways, although they're working on speeding it up, and scan on a USB disk will be slower.

But if you only scan once, which is normal if you're not developing code and switching versions every hour, you'll be fine.

duck
2005-11-11, 18:29
dwc wrote:
> I just want to make sure using one of these external IDE to USB 2.0
> converters is going to be fast enough. I expect it is, but just wanted
> feedback in case not.
>
> Thanks,
> Dan
>
> this is the one I've ordered:
> http://www.newegg.com/Product/Product.asp?Item=N82E16817145131
>
>

i've got a similar model:
http://www.newegg.com/Product/Product.asp?Item=N82E16817145125
connected to a genuine usb 2.0 ehci controller on my suse 9.1
laptop. (it's important to hook it up to a 2.0 controller;
you'll probably get about 10% of this speed using a USB1.0
host.)


with a seagate 7200.7 installed in it, i get this:
$ sudo hdparm -t /dev/sda

/dev/sda:
Timing buffered disk reads: 74 MB in 3.02 seconds = 24.52 MB/sec


and for reference, i get this on my 5400 rpm ide root drive:
$ sudo hdparm -t /dev/hda

/dev/hda:
Timing buffered disk reads: 100 MB in 3.02 seconds = 33.08 MB/sec



cheers,
--duck

stinkingpig
2005-11-12, 14:42
Duck wrote:

> dwc wrote:
>
>> I just want to make sure using one of these external IDE to USB 2.0
>> converters is going to be fast enough. I expect it is, but just wanted
>> feedback in case not.
>>
>> Thanks,
>> Dan
>>
>> this is the one I've ordered:
>> http://www.newegg.com/Product/Product.asp?Item=N82E16817145131
>>
>>
>
> i've got a similar model:
> http://www.newegg.com/Product/Product.asp?Item=N82E16817145125
> connected to a genuine usb 2.0 ehci controller on my suse 9.1
> laptop. (it's important to hook it up to a 2.0 controller;
> you'll probably get about 10% of this speed using a USB1.0
> host.)
>
>
> with a seagate 7200.7 installed in it, i get this:
> $ sudo hdparm -t /dev/sda
>
> /dev/sda:
> Timing buffered disk reads: 74 MB in 3.02 seconds = 24.52 MB/sec
>
>
> and for reference, i get this on my 5400 rpm ide root drive:
> $ sudo hdparm -t /dev/hda
>
> /dev/hda:
> Timing buffered disk reads: 100 MB in 3.02 seconds = 33.08 MB/sec


This sort of testing is very chipset and driver dependent; I got 36
MB/sec out of my USB2 7200rpm drive on my T40 running SuSE 9.3 or XP,
but that same drive on my Mandrake 10.1 server gets lousy performance:

/dev/hda:
Timing buffered disk reads: 102 MB in 3.08 seconds = 33.12 MB/sec
/dev/hdc:
Timing buffered disk reads: 130 MB in 3.01 seconds = 43.19 MB/sec
/dev/sda:
Timing buffered disk reads: 56 MB in 3.01 seconds = 18.60 MB/sec

Linux USB is still pretty immature in my opinion, and I'd test carefully
before trying it in production; I've had plenty of filesystem
corruption, kernel panics, and nastiness like system load of 14 while
writing to the drive. On the other hand, that /dev/sda drive is reliable
as long as I don't use it much.

--
Jack At Monkeynoodle Dot Org: It's A Scientific Venture!
"I spent all me tin with the ladies drinking gin
so across the Western ocean I must wander" -- trad.

dwc
2005-11-12, 19:59
Thanks gents, looks like a go.
I just hope that my old laptop has usb 2...
-Dan

pfarrell
2005-11-12, 20:06
On Sat, 2005-11-12 at 18:59 -0800, dwc wrote:
> Thanks gents, looks like a go.
> I just hope that my old laptop has usb 2...

Old laptops often are poor performers in many dimensions.
Slow disks, slow memory, slow CPUs, in addition to slow
video, USB 1.1 etc. But if you already have it, give
it a try. The worst that can happen is that it will
be too slow, and you'll have to use an old desktop.


--
Pat
http://www.pfarrell.com/music/slimserver/slimsoftware.html

hickinbottoms
2005-11-14, 01:16
I have an old laptop and use external USB disks. My laptop didn't have USB 2
so I bought a USB 2 PCMCIA card, which also had the advantage of having two
ports (the laptop only had one). The card cost me about 15, from memory,
and was supported under Linux just fine.

With USB 2 external disks on that old laptop (~450MHz), I get perfectly
acceptable performance - and my library is nearly all FLAC.

Stuart


-----Original Message-----
From: discuss-bounces (AT) lists (DOT) slimdevices.com
[mailto:discuss-bounces (AT) lists (DOT) slimdevices.com] On Behalf Of dwc
Sent: 13 November 2005 3:00 AM
To: discuss (AT) lists (DOT) slimdevices.com
Subject: [slim] Re: Extrnal USB drive fast enough?


Thanks gents, looks like a go.
I just hope that my old laptop has usb 2...
-Dan


--
dwc
------------------------------------------------------------------------
dwc's Profile: http://forums.slimdevices.com/member.php?userid=1892
View this thread: http://forums.slimdevices.com/showthread.php?t=18108