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Standard User Banger
(eat-sleep-adslguide) Fri 01-Jan-16 15:56:13
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power on calculation


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Can anyone tell me what 1.5 million hours given in reliability specs is in years, this just fries my brain?

Tim
www.xilo.net & freenetname
Billion 7800 on 24 Meg LLU
http://www.thinkbroadband.com/speedtest/results.html...
Standard User micksharpe
(legend) Fri 01-Jan-16 16:05:51
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Re: power on calculation


[re: Banger] [link to this post]
 
1,500,000 / 8,766 = 171 years

No need for back-ups, then. wink

Man does not control his own fate. The women in his life do that for him. -- Groucho Marx
Standard User Banger
(eat-sleep-adslguide) Fri 01-Jan-16 16:07:26
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Re: power on calculation


[re: micksharpe] [link to this post]
 
That's mad for an SSD

Tim
www.xilo.net & freenetname
Billion 7800 on 24 Meg LLU
http://www.thinkbroadband.com/speedtest/results.html...


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Standard User micksharpe
(legend) Fri 01-Jan-16 16:22:49
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Re: power on calculation


[re: Banger] [link to this post]
 
Such high MTBF values must necessarily be estimates and, as such, are only really of interest to data centres where hundreds (and perhaps thousands) of devices will be in continuous use. Fretting about how long your SSD drive is going to last you is a waste of time. Bear in mind that the NAND gates in flash memory start to fail after a few thousand write cycles and so your SSD will start to lose capacity soon enough (as sectors are reallocated) even if you never experience an outright failure.

Data centres can measure SSD shrinkage rates for themselves and plan accordingly but they must rely on manufacturers' estimates in order to plan for (inevitable) outright failures. For you and me, things are simpler but less certain. Your SSD may last for months or years. Enjoy the high speeds that it gives you but make regular backups. Hope for the best, prepare for the worst, and forget about MTBF values.

Man does not control his own fate. The women in his life do that for him. -- Groucho Marx

Edited by micksharpe (Fri 01-Jan-16 16:24:38)

Standard User cheshire_man
(knowledge is power) Fri 01-Jan-16 16:24:25
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Re: power on calculation


[re: micksharpe] [link to this post]
 
In reply to a post by micksharpe:
1,500,000 / 8,766 = 171 years

No need for back-ups, then. wink
Hmm, as 2100 isn't a leap year, 8766 (365.25*24) is slightly inaccurate for a period extending into the next century.

wink wink wink

Me pedantic? Surely not grin

Tony
We have more and more laws, and less and less enforcement
Standard User micksharpe
(legend) Fri 01-Jan-16 16:25:42
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Re: power on calculation


[re: cheshire_man] [link to this post]
 
Happy new year, Tony. smile

Man does not control his own fate. The women in his life do that for him. -- Groucho Marx
Standard User gomezz
(eat-sleep-adslguide) Fri 01-Jan-16 16:28:17
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Re: power on calculation


[re: cheshire_man] [link to this post]
 
How much "green" energy would we need to extract from the spin of the earth to slow it down enough that we would need to make 2100 a leap year?

BT Infinity 1 (unlimited)
Standard User TinyMongomery
(experienced) Sat 02-Jan-16 15:26:40
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Re: power on calculation


[re: cheshire_man] [link to this post]
 
In reply to a post by cheshire_man:
In reply to a post by micksharpe:
1,500,000 / 8,766 = 171 years

No need for back-ups, then. wink
Hmm, as 2100 isn't a leap year, 8766 (365.25*24) is slightly inaccurate for a period extending into the next century.

wink wink wink

Me pedantic? Surely not grin
Not pedantic enough! smile

The 171 years was only accurate to zero decimal places and adding another 24 hours gives exactly the same figure.
Standard User cheshire_man
(knowledge is power) Sat 02-Jan-16 16:21:21
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Re: power on calculation


[re: TinyMongomery] [link to this post]
 
In reply to a post by TinyMongomery:
In reply to a post by cheshire_man:
In reply to a post by micksharpe:
1,500,000 / 8,766 = 171 years

No need for back-ups, then. wink
Hmm, as 2100 isn't a leap year, 8766 (365.25*24) is slightly inaccurate for a period extending into the next century.

wink wink wink

Me pedantic? Surely not grin
Not pedantic enough! smile

The 171 years was only accurate to zero decimal places and adding another 24 hours gives exactly the same figure.
Indeed, it was the 365.25 that was the root (pedantic) inaccuracy, not the rounded 171 years; though in my defence I didn't claim 171 years was inaccurate grin

To be utterly pedantic (or sad! Aren't spreadsheets wonderful...), assuming the clock started at midnight New Year's Eve/New Year's day, the 150,000 hours would be up 6,250 days later, at midnight 12/13th February 2187, 171.2986 years later.

I strongly suspect that nobody here will be around to verify that life expectancy claim...

Tony
We have more and more laws, and less and less enforcement
Standard User micksharpe
(legend) Sat 02-Jan-16 16:35:16
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Re: power on calculation


[re: cheshire_man] [link to this post]
 
I suspect that most SSDs would last a very long time indeed, providing that you never write any data on them. wink

Man does not control his own fate. The women in his life do that for him. -- Groucho Marx
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