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Windows 7: Why is HDD speed related to ReadyBoost?


14 Nov 2013   #1

Windows 7 Professional 64-bit
 
 
Why is HDD speed related to ReadyBoost?

From the Windows help file:
"If your computer has a hard disk that uses solid-state drive (SSD) technology, you may not see an option to speed up your computer with ReadyBoost when you plug in a USB flash drive or flash memory card. This is because some SSD drives are so fast they're unlikely to benefit from ReadyBoost."

What does ReadyBoost have to do with HDD speed at all? Doesn't it just use a flash drive as fake RAM?

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14 Nov 2013   #2

Desk1 8 Pro / Desk2 7 Home Prem / Laptop 8.1 Pro all 64bit
 
 

Basically not much at all if you look at this it will explain. A lot of people think it is actually virtual RAM but only a sort of caching I never found it of any use whatsoever.
ReadyBoost - Wikipedia, the free encyclopedia
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14 Nov 2013   #3

Windows 7 Professional 64-bit
 
 

Call me blind but I can't find anything on the Wikipedia page that says it's related to the HDD at all except that the flash drive cache is "faster than the hard drive being cached". This begs the question, why is readyboost disabled by default whenever you have an SSD?
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14 Nov 2013   #4

W7 Pro SP1 64bit
 
 

I could be wrong - but doesn't MS put the SuperFetch info into the ReadyBoost RAM space? I don't think that the RAM was intended as a generic addition to the existing RAM.

The best thing would be to put the SuperFetch info into regular RAM.
(But you might not have enough RAM - hence the ReadyBoost offer.)

The second best thing would be to put the SuperFetch info into the swap file.
(If that swap file is on an SSD...
...then that will be faster than putting the SF info into ReadyBoost RAM),

Why would MS want to offer you an option to slow your computer down?


edit: that info is wrong - I think.

Again - I could have this all wrong. It has been a while since I looked into it.
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14 Nov 2013   #5

Windows 7 Professional 64-bit
 
 

What exactly do you mean by "SuperFetch info"? Wouldn't that just be the information Windows has about what programs to 'fetch' into memory, and thus be relatively small and probably not even in memory to begin with?
If you mean the page file, well what if the page file is disabled?
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14 Nov 2013   #6

Desk1 8 Pro / Desk2 7 Home Prem / Laptop 8.1 Pro all 64bit
 
 

Quote   Quote: Originally Posted by M4dn3ss View Post
What exactly do you mean by "SuperFetch info"? Wouldn't that just be the information Windows has about what programs to 'fetch' into memory, and thus be relatively small and probably not even in memory to begin with?
If you mean the page file, well what if the page file is disabled?
Windows Vista I/O technologies - Wikipedia, the free encyclopedia scroll down to superfetch.
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14 Nov 2013   #7

Windows 7 Professional 64-bit
 
 

As I said, SuperFetch info wouldn't need to be stored in RAM since it's just a bit of data about what programs are most used and whatnot
My System SpecsSystem Spec
14 Nov 2013   #8

W7 Pro SP1 64bit
 
 

Quote   Quote: Originally Posted by M4dn3ss View Post
As I said, SuperFetch info wouldn't need to be stored in RAM since it's just a bit of data about what programs are most used and whatnot
I don't think that your understanding of SuperFetch is complete.
(I know that my understanding of SuperFetch is limited :-)


Perhaps this document can help us:
Windows PC Accelerators

Specifically:
Quote:
If a device supports ReadyBoost, it provides a dedicated area where SuperFetch can securely store a copy of performance-crucial data. SuperFetch can retrieve data from a cached copy on nonvolatile flash storage much faster than from disk. SuperFetch typically compresses the data that it writes to the cache at a 2:1 ratio; sometimes it can compress up to a 3:1 ratio. By default, SuperFetch encrypts using 128-bit Advanced Encryption Standard (AES) to ensure security of the data.
Some (most?) SuperFetch info loads/stays in RAM.
edit: maybe not
My System SpecsSystem Spec
14 Nov 2013   #9

Desk1 8 Pro / Desk2 7 Home Prem / Laptop 8.1 Pro all 64bit
 
 

Quote   Quote: Originally Posted by M4dn3ss View Post
As I said, SuperFetch info wouldn't need to be stored in RAM since it's just a bit of data about what programs are most used and whatnot
Yes I think User described it better than me then - I am just curious as to why you need to know are you fixing an old machine or is it yours? Because if it is your machine and it is running perfectly ok I have lost the plot somewhere here.

Now if it is your machine and it is running out of RAM just throw in another 4GB as I see it is DDR2 not that it is no good in fact my tester runs perfectly well on 4GB.
If the machine spitting the dummy playing games maybe the RAM is on the way out in which case I would push a memtest through it.
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14 Nov 2013   #10

Windows 7 Professional 64-bit
 
 

Sorry I misunderstood you, you made it sound like you meant SuperFetch info as in "the data that Windows stores about what should be prefetched" rather than "the stuff that is actually being prefetched".
Anyway I still don't see what the HDD has to do with it, since prefetch data is either in RAM or it's on a ReadyBoost drive, never on a hard drive. Unless it's in the page file.
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 Why is HDD speed related to ReadyBoost?




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