zalohovani a nova media

[Dalibor Straka]

On Wed, Aug 10, 2005 at 01:20:42AM +0200, Petr Vileta wrote:
> Vladimir Rengevic wrote:
> > Co sa tyka spolahlivosti zaloh na flash diskoch a podobnych pamatovych
> > mediach je dobre si uvedomit, ze ukladame
> > informacie do nabiteho kondenzatora (vpodstate). Takze ak sa zace
> > naboj stracat prideme aj o data.
> Ja znam ruzne HW, kde v pametech EEPROM (taky kondenzatory) je program 
> ulozen uz vice jak 15 let. Ale to jsou jeste stare poctive pameti ze CCCP 
> (Sovetsky svaz - pro ty mladsi) :-)))
> 
Je to sice hodne OT: "EEPROM nejsou kondiky"
Each bit is a floating gate transistor set by quantum tunneling
electrons across a thin dielectric barrier. The electron flow through
the barrier causes defects to build up in the thin layer of silicon
dioxide, leading to its wear known as tunnel oxide degradation. Because
of this, it may be erased and reprogrammed only a certain number of
times. Write/erase cycle lifetimes range from 100,000 to 10,000,000, but
an EEPROM can be read from an unlimited number of times. The write and
erase operations require considerably high voltage (12 to 20V)

A je to logicke, kazdy kondenzator ma svodovy odpor a dalo by se
spocitat jak velky by musel byt, aby se za 15 let pres nej C nevybil.

> Jenze on to asi nikdo na dlouhodobejsi ukladani nepouziva, co? Takze 
> zkusenosti asi stejne nebudou.

Vetsinu dat zhruba po trech letech prelejvam na nova media
Z historickych 5,25" na disk, pozdeji na 3,5", z disket na cd, pak
z cd na dvd s mezistupnema na velke disky. Ruzne, podle toho na co mam
ten rok naladu, provadim konsolidaci mp3, filmu, starych zdrojaku,
skolnich praci atd.

Zdaleka nejvice casu mi zabere trideni zdrojaku. Zejmena ty stare
assemlberovske ma clovek tendenci otevirat a divat se, jak to tehdy
vlastne myslel.
-- Dalibor Straka