Windows 7 Forums

Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: Write Caching and Defragging External HDD

04 Sep 2010   #1

Windows 7 64bit
Write Caching and Defragging External HDD

Hello all! I have two concerns...

1. My external HDD has 64mb of cache and is connected via Uninterrupted Power Supply (UPS) 1200va along with my entire computer. Should I enable write caching, and how will enabling it benefit me?

2. I have been using ShadowProtect to backup my data and OS; is it okay to defrag this external drive? Will it negatively affect my backup data?

Thanks everyone!

My System SpecsSystem Spec

04 Sep 2010   #2

Microsoft Community Contributor Award Recipient

Windows 10, Home Clean Install

Question 2. If the back up is on the external drive do not defrag, you can lose all of your data and then you have to start over.
My System SpecsSystem Spec
05 Sep 2010   #3

Windows 7 Ultimate x64

Write caching allows the data to be "cached" and written to the drive at a later time. The OS tells the application that everything is saved and the app can move on again. That's why batteries are important, because if you were to immediately lose power...the data in the cache wouldn't actually get written. But with a battery, that system stays operational and the data is written.

Defrag on external drive. Probably unnecessary. Any slow down from fragmentation is far and away less than accessing the drive through external standards like USB 2.0.
My System SpecsSystem Spec

05 Sep 2010   #4

Windows 7 64bit

So you mean that even after the computer is turned off.... the data is still being written?
My System SpecsSystem Spec
05 Sep 2010   #5
Hopalong X

Windows7 Pro 64bit SP-1; Windows XP Pro 32bit

I think pparks means that when the system is shut off abruptly all unsaved data is lost.
Temp caches etc.

When Windows shuts down normally I'm sure you noticed the main screen drops the icons and it says closing Windows and then off.
Sometimes it tells you at normal shut down "Saving your settings" which is saving things not saved yet or that will be needed on next start.

If you have no back up battery and you have an abrupt power loss all the info that would have been saved at normal shutdown of Windows is lost.

My explanation might not be technical or exact but it is "generally" how I understand it.

I'm sure someone will come up with the technical part.
My System SpecsSystem Spec

 Write Caching and Defragging External HDD

Thread Tools

Similar help and support threads
Thread Forum
I have all my external drives set to "quick removal" option, so I don't have to use the "safe-removal" option. On my internal drives, I have it set to "Enable write caching." It says that a power outage could cause data loss. Since I always use the "sleep" option, is this option...
Performance & Maintenance
For the write caching experts
On another thread I had stated that there will be a performance hit if you turn off write caching for a SSD. But on second thought, I am not so sure any more. What write caching allows (in my understanding) is to accumulate records in a buffer so that so that they can be written to the disk in...
Hardware & Devices
Write caching or ???
With explorer. Copy a large, say 700mb file from folder a to b on a regular HDD, should take 10-15 secs right. If you watch resmon, disk activity, you will see write activity to the destination folder for almost a full minute afterwards. Anyone know what's going on here? I don't have restore...
General Discussion
Write Caching
So, it's time I asked a question. I've got this awesome little 7eeePC you've probably read about as I babble on about it like a schoolgirl in many of my posts and I'd like to show of it's WEI score to convince folks it's not quite as castrated as some have insinuated. Only, the machine will not...
Problem with Write Caching :(
I have a problem. Isn't available policy of Performance Disk, and... write caching not working. And I can not find its way to activate it from other side. In the device manager, into the options of the disk, Performance Policy not appears. Before it was available in previous betas, but in this...
Hardware & Devices
Write caching
Ok, so my hard drive in ACHI mode does not allow me to enable write caching but in compatibility mode it does. Should I enable write caching? Also this whole thing about memory loss is bugging me on what they are talking about. I have a laptop with a battery and mostly has power. But what if...
Performance & Maintenance

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 09:28.

Twitter Facebook Google+

Windows 7 Forums

Seven Forums Android App Seven Forums IOS App