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Re: Alternative to using USB-Stick as mass storage on NSLU2

On Feb 18, 2010, at 12:55 PM, Björn Wetterbom wrote:

I've used a Freecom 2.5" drive for a couple of years with good
results. USB powered of course.

I've also used an external WD 3.5" drive which I am very pleased with,
and since WD offers a wide variety of 2.5" drives at good prices I
would go for one of those.


On Thu, Feb 18, 2010 at 18:02,  <u7l11ey@mail.lrz-muenchen.de> wrote:
John Holland wrote

You could use a 2.5" HDD. The Momentus has a typical usage specified @
1.5W seek and .7W idle.

Thanks for pointing out the low energy consumption of modern 2.5" HDs. Since others mentioned that SD is even less suitable for my purpose, I
think I'll go that route.

Can anybody recommend a specific model of an external 2.5" drive that
works well with a slug under Debian (Lenny armel), preferably USB- powered
so I don't need an extra power supply?

I've read a lot on nslu2-linux.org about spindown issues with HDs
connected to a slug. Since my slug is logging data continuously 24/7, I guess I shouldn't let the HD spin down at all. Is that assumption correct?

Regards, Richard

Sounds like a fun project! Please keep us informed on what you wind up doing.

If whatever you use works OK with only USB power, that's great. But I'd make sure that any external hard-drive at least has the *option* of external power, incase it turns out that the Slug can't provide enough to, e.g. spin-up at boot time.

Of course, external power will probably mean more total power drain (due to losses in the transformer, etc...) There are trade-offs in all things.

Another low-power option would be to use a larger USB-stick (e.g. 8GB) which will allow the writes to be spread over more memory cells, increasing the total life of the stick.

And yet a third idea: You can rent a few gigabytes of storage "in the cloud" from places like Amazon.com. Then you could use the cloud- storage as an energy efficient backup for your log files.

Whatever you do, frequent backups are always a good idea.



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