In
<ofeeb22c6c.b200d94c-on48257d9e.002229fa-48257d9e.002d8...@sg.ibm.com>,
on 11/28/2014
   at 04:14 PM, Timothy Sipples <[email protected]> said:

>Setting aside current pricing, what are the characteristics of 
>hard disks that make them better suited to particular use cases 
>than (modern, current) SSD?

You don't have to worry about doing too many writes to the same track.
Caveat: I don't guaranty that there will be an equivalent issue with
newer SSD technology.

>- mercury delay line memory;

That was volatile main memory, not nonvolatile auxilliary storage.

>- data cell drives (i.e. the IBM 2321);
>A fascinating device but way before my time.

It was more recent than the mercury delay line! Probably more
reliable, hard though that may be to believe.
 
-- 
     Shmuel (Seymour J.) Metz, SysProg and JOAT
     ISO position; see <http://patriot.net/~shmuel/resume/brief.html> 
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)

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