> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
> Henning Sprang
> Sent: 23 January 2006 12:31
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] Xen on USB Key
>
> On Mon, 2006-01-23 at 12:17 +0000, William Man wrote:
> > I had initial thoughts along the same line. I have built
> the kernel
> > to run off a key, but not tried it yet.
> > But ALL logging need to be moved to tmp, all lock files need to be
> > moved to tmp, etc...
> >
>
> I heard of people building usb-bootable version of some
> (live)distributions, and that they had to deal with similar issues.
> Maybe it's worth looking at them how they solve this issue.
> Sorry for not having a link at hand, I just remember
> something like that.
>
>
> > As the general lifetime of a key is like 10yrs, if you only
> write on
> > it once/twice a day. But if you use it daily then..... it
> won't last long.
> >
>
> What is "not long"?
> If it's only a month, that's probably enough! That's a cool
> tool, if you use it daily, spending 20Dollars/Euros each
> month for a new USB stick is not exactly a lot compared the
> usefullness of that tool.
>
> The same technology could probably applied to 2.5" usb
> harddisk, making it slightly bigger, but still possible to
> have your complete desktop in a shirt's pocket.
>
> Henning
>
A flash device will allow writing to the same block (sector) at least
100000 times, AMD/Spansion devices support 1000000 writes to the same
block. A write, in this case, is defined as a complete cycle of erase
(make it all ones) and program to zeros.
If you do a write every second (to the same place), one million seconds
is about 11 days (277 hours), but it's very unlikely that a clever Flash
File-system would allow you to write to the same area over and over
again, as it's normally remapping sectors when they are written, rather
than doing a erase/write cycle, so it should last a lot longer than
that. [Caching in the OS will also help if you're writing to the same
place].
--
Mats
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