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Windows 7: "ReadyBoot"

14 Jun 2010   #1

w7 Ultimate 32bit

It is some time now that I am getting very frequently the following message:
The maximum file size for session "ReadyBoot" has been reached. As a result, events might be lost (not logged) to file "C:\Windows\Prefetch\ReadyBoot\ReadyBoot.etl". The maximum files size is currently set to 20971520 bytes.

I have read that "this is nothing" and just go on as it is not there.
But the actual boot time has deteriorated considerably.

Is there any solution or improvement that can bring back boot times in decent levels?
Are there any processes that I would have to check if they are activated or not?

My System SpecsSystem Spec
14 Jun 2010   #2

7 Ultimate x64

You have 4GB's of RAM. Ready Boost is pointless and not improving anything for you. To increase performance, remove the USB stick.
My System SpecsSystem Spec
15 Jun 2010   #3

w7 Ultimate 32bit

It is not Ready Boost I am asking but Ready Boot.
Nothing to do with any USB stick.
My System SpecsSystem Spec

15 Jun 2010   #4

7 Ultimate x64

Ahh... my bad.

However, it doesn't seem like it's helping you. If you want to speed up boot/reboot times, why not instead follow these guides?

Operating System to Start - Change Display List Time

Shut Down -Speed Up

As far as ReadyBoot goes, I can't find anything on it that pertains to 7, only Vista, and even then, early Vista as it related to XP:
Windows Vista uses the same boot-time prefetching as Windows XP did if the system has less than 512MB of memory, but if the system has 700MB or more of RAM, it uses an in-RAM cache to optimize the boot process. The size of the cache depends on the total RAM available, but is large enough to create a reasonable cache and yet allow the system the memory it needs to boot smoothly.
After every boot, the ReadyBoost service (the same service that implements the ReadyBoost feature just described) uses idle CPU time to calculate a boot-time caching plan for the next boot. It analyzes file trace information from the five previous boots and identifies which files were accessed and where they are located on disk. It stores the processed traces in %SystemRoot%\Prefetch\Readyboot as .fx files and saves the caching plan under HKLM\System\CurrentControlSet\Services\Ecache\Parameters in REG_BINARY values named for internal disk volumes they refer to.
The cache is implemented by the same device driver that implements ReadyBoost caching (Ecache.sys), but the cache's population is guided by the ReadyBoost service as the system boots. While the boot cache is compressed like the ReadyBoost cache, another difference between ReadyBoost and ReadyBoot cache management is that while in ReadyBoot mode, other than the ReadyBoost service's updates, the cache doesn't change to reflect data that's read or written during the boot. The ReadyBoost service deletes the cache 90 seconds after the start of the boot, or if other memory demands warrant it, and records the cache's statistics in HKLM\System\CurrentControlSet\Services\Ecache\Parameters\ReadyBootStats, as shown in Figure 2. Microsoft performance tests show that ReadyBoot provides performance improvements of about 20 percent over the legacy Windows XP prefetcher.
Windows Administration: Inside the Windows Vista Kernel: Part 2

I think if you just undo whatever it is you did, you'll find boot times speed up... even more so if you follow the guide.
My System SpecsSystem Spec
15 Jun 2010   #5
Microsoft MVP

Win 7 Ultimate x64

Didn't happen to disable the ReadyBoost service did you? As shown in the quote above the service is required for ReadyBoot to function.

Another thing I found in regard to that error is to change the following in regedit,


The default value for MaxFileSize is decimal value 20. Double-click MaxFileSize and set the value larger than 20 e.g.60
My System SpecsSystem Spec
15 Jun 2010   #6

w7 Ultimate 32bit

Thanks for the input.
ReadyBoost was disabled so I enabled it back. Unfortunately no improvement yet (but I wiil try also the registry tweak). In principle, I would expect that this file would be overwritten by Windows automatically when size limit reached.

And just after that I panicked...

Checking around in the system, it seems that I have a much worst problem than this. Please look at the attachment, screenshot from my registry.
See the first 8 entries and the very last in HKEY_CURRENT_USER?
Do you know how these entries could show up there (for example by BSOD's or memory crashes)?
Would it be safe just to delete them (all have the value that is shown for the first)?
Do you know of any utility that analyses the boot process (I remember something like it for XP)?

My System SpecsSystem Spec
15 Jun 2010   #7

MS Windows 7 Ultimate SP1 64-bit

If it works, don't fix it.

With that said, there is a program which has even received the right to use the Win 7 compatible logo which may, just may, help you.

That program is CCleaner. CCleaner has two main parts-one for doing much the same as Disk Cleanup and the other is to clean the registry.

Now there are those who will talk about registry cleaners as if they are worse than a sexually-transmitted disease. I have used CCleaner for quite awhile on Vista and Windows 7 systems. I have never had any problems.

I recommend that you download and run CCleaner. I use it daily.

CCleaner - Optimization and Cleaning - Free Download
My System SpecsSystem Spec
15 Jun 2010   #8

w7 Ultimate 32bit

I just ran it, but these entries are not even listed in CCleaner issues list.
So, I guess the only option is to make a restore point and delete manually?
Any ideas/knowledge on how they are created (so I do something to avoid this)?
My System SpecsSystem Spec
15 Jun 2010   #9

MS Windows 7 Ultimate SP1 64-bit

Try a System Repair.


1) Make a System Repair Disk (WIN key| type Create System Repair Disk | ENTER key)
2) Insert System Repair Disk into optical reader.
3) Shutdown your computer.
4) Boot up your computer from the System Repair Disk (if needed, Power on button, immediately hit F2 key, change boot order to have boot from cd/dvd first).
5) Wait while a mini-version of Windows is loaded and finally the System Recovery Options dialog appears.
will show Select a keyboard input method |
NEXT button
will search your system for installed versions of Windows.
select the Use recovery tools that can help fix problems starting Windows radio button |
NEXT button
will show Choose a recovery tool and list the following |
System Repair
System Restore
System Image Recovery
Windows Memory Diagnostic
Command Prompt

10) Click on System Repair and run system repair
11) Repeat running of System Repair 3 times
12) Remove the System Repair Disk CD
13) SHUTDOWN button
14) Power On your computer

My System SpecsSystem Spec
15 Jun 2010   #10

w7 Ultimate 32bit

You reckon that system repair can delete registry entries ?
(I suppose that I can use the Windows installation disk, right?)
My System SpecsSystem Spec


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