On Fri, 25 Jul 2008, J Cruit wrote:

> Not to add to the slam but if you are looking for multiple drives rather 
> than one big one (and to maintain an apples to apples comparision) these 
> Western Digital 320GB 7200 RPM 16MB Cache SATA 3.0 drives are only 64.99 
> with free shipping.  Thats 2 brand new drives with 40 extra GB for 130$, 
> a 20$ savings off the listing price.
>
> http://www.newegg.com/Product/Product.aspx?Item=N82E16822136098
>
> Its a shame but hard drives loose their value quickly as cheaper, 
> faster, bigger, better keeps going on the market.


Yep.  An old prof at UW-Madison told me that in 1967 they bought a hard 
drive for their big card-reading computer:  The drive cost $66,000 and it 
held 2 MB ($33,000,000 per GB).  In 1986 I bought a 30 MB HDD for $450 
($15,000 per GB).  We can now buy a 750 GB HDD for $99 ($0.132 per GB).

So HDD price per GB improved by a factor of 2,200 times from 1967 to 1986 
and by a factor of about 114,000 times from 1986 to 2008, and the 
improvement was about 250 million fold from 1967 to 2008.

I therefore do not recommend HDDs as investments!  ;-)

It's the same for flash drives.  A friend bought an 8GB flash thumb drive 
for $27 a few weeks ago.  My son bought a 4GB flash at Christmas time for 
$30.  I bought a 1GB flash in 2005 (I believe it was 2005) for $20.  So 
the number of GB per dollar on flash also is increasing at faster than 
exponential rates.

If this keeps up, what will we be buying in 20 more years??!!

Mike