Rick,

Today's SSD is not like the ones we ran a decade ago.  The SSD of today is made 
with Flash memory, like in the thumb drive you plug into you PC's USB port.  
They don't need power to retain data.  Forgive the Firesign reference, but, 
"Everything you know is wrong" :-)

>>> Rick Fochtman <rfocht...@ync.net> 03/29/10 7:23 PM >>>
-------------------------------------<snip>---------------------------------------

>> <>A long absence of power to affect refreshes of solid state storage 
>> can still render solid state storage unusable, while true disks don't 
>> need refreshing to maintain the content.
>
There are some shops, in the Greater Toronto Area, using them in production.
----------------------------------<unsnip>--------------------------------------
I was once in a shop that used them in production as well. As LOCAL page 
devices. The level of trust just wasn't there to allow any other usage.

------------------------------------<snip>----------------------------------<>

>>Also, power surges and vagaries in supply voltage and/or current levels are 
>>less likely to affect a hard drive, even though the cirtuitry to avoid these 
>>vagaries is becoming more and more prevalent today.
>>    
>>
>
>UPS and power conditioning come to mind.
>Who powers their data centre straight from the grid, these days?
>  
>
-----------------------------------<unsnip>---------------------------------
I thinkk you'll find a significant, though maybe not large, number of 
shops running straight from the grid today. For those shops, the cost of 
an outage may be lower than the cost of power conditioning and/or UPS 
equipment. Let's face it, not all "business decisions" make good sense, 
in spite of what we'd all like to think.

-------------------------------------<snip>--------------------------------------

>> <>Can we all remember the STC "Solid State Disk"? And manufacturing 
>> vagaries can still have severe and detrimental effects on solid-state 
>> memory, whereas the manufacture of magnetic disks is fairly well 
>> solidified today, except for incremental changes that affect capacity.
>
Then stop using Cache and CPU memory.

It's the same chipsets, in most cases.
----------------------------------------<unsnip>--------------------------------
The chip design may be the same, but are the manufacturing facilities up 
to the same quality control standards? More and more "makers" doesn't 
always mean equal quality across the board. The the firm of "Dewey 
Cheatem & How" have the same standards as, for example, INTEL? To 
survive, the prices have to be competitive and so does the quality. And 
how many managerial-types will look at a lower price and make their 
decisions based entirely on price? Every business has its share of 
airheads and IT is certainly no exception.

-----------------------------------------<snip>-------------------------------------<>

>>I predict that magnetic disk technology will bbe with us for the foreseeable 
>>future.
>>    
>>
>
>No more than two or three mainframes will ever be sold.
>Nobody will ever need more than 640K of memory.
>  
>
-----------------------------------------<unsnip>----------------------------------
Yeah, we've all heard those predictions and seen just how incredibly 
wrong they were. I might be just as wrong. Only time will tell. :-)

--------------------------------------<snip>-------------------------------------
Too busy driving to stop for gas!
--------------------------------------<unsnip>-------------------------------------
You've been saying that for as long as I can remember. Eat lots of beans 
and you don't need to stop for gas!  :-))

Rick

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