Re: Deleting old system Partition

On Aug 21, 11:39 am, "R. C. White" <r...@xxxxxxxxxxxxx> wrote:
Most important, the power is conditioned so that a glitch doesn't cause bits
in RAM or on my hard drive to get scrambled! Many times, the power
interruption is only momentary - a second or two or less. ...

That first UPS cost me nearly $1,000, but my latest was more like $100.
WELL worth it!

When does a computer see some of the most 'dirty' electricity?
When a UPS switches to battery backup mode. UPS normally connecting a
computer directly to AC mains provides some of the cleanest
electricity. Because that UPS is so cheap, because AC mains
electricity is so clean (despite myths to the contrary), and because
computers must be so robust as to make even 'dirty' UPS electricity
irrelevant - where is this protection provided by the UPS? Even the
UPS manufacturer specs do not make those claims.

For example, this 120 volt UPS in battery backup mode outputs two
200 volt square waves with a spike of up to 270 volts between those
square waves - a modified sine wave. Electricity so 'dirty' as to
even harm some small electric motors. Electricity so dirty that UPS
manufacturer caution against putting a power strip protector on its
output.

An industry standard: a computer must be so robust as to make that
that 'dirty' UPS output irrrelevant. Brownouts also do not harm
properly constructed electronics - an industry standard even long
before PCs existed. AC power problems must never affect DIMMs -
another job of a power supply. How much money was 'saved' on that
supply? When computer assemblers don't even know how electricity
work, then power supplies with missing functions, higher profit
margins, and lower price are routinely dumped into the market. By
saving $30 on a power supply, one must buy a $100 UPS?

Another industry standard. AC electric voltage can drop so low that
incandescent lamps dim to 40% intensity and still every computer must
even power up just fine. Yes, another industry standard that says how
low voltage can go and the computer must still work. Why do some need
a UPS? Reasons include they don't know anything about electricity or
they saved money on cheaper parts.

UPS serves one function - protect data from blackouts or extreme
brownouts. Neither must cause hardware failure. And neither is
solved by any surge protector.
.

Relevant Pages

  • Re: Lightning - funny how were not seeing him any more
    ... Now for a typical plug-in UPS. ... a problem made completely irrelevant by 'protection' already ... inside a minimally acceptable computer power supply. ... computer to some of the 'dirtiest' electricity. ...
    (microsoft.public.windowsxp.hardware)
  • Re: back-up power supply
    ... :I was thinking to get a back-up power supply for my PC and saw a book ... The least expensive type of UPS is 'passive'. ... the battery goes back out again when the power returns. ... One issue with passive UPSs is that the electricity is not flowing ...
    (comp.security.misc)
  • Re: Lightning - funny how were not seeing him any more
    ... a modest brownout where incandescent bulbs dim to 50% intensity: a problem made completely irrelevant by 'protection' already inside a minimally acceptable computer power supply. ... plug-in UPS exposes computer to some of the 'dirtiest' electricity. ...
    (microsoft.public.windowsxp.hardware)
  • Re: Electricity!
    ... Reason for having a UPS is to protect from data loss. ... power supply should work just fine even when AC electric voltage is so ... And yet even that 'dirtiest electricity' ...
    (soc.motss)
  • Re: New GE Incandescent Lamp Technology
    ... and only purchase renewable electricity. ... I had the impression some or all of their power ... coal-fired and much of this would be considered as "dirty". ... metric tonnes of CO2, over 10 million metric tonnes of SO2 and almost ...
    (sci.engr.lighting)
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