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HDD cache. Saving money

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June 5, 2013 2:51:55 PM

If I have a choice between 2 HDDs, one with 16mb cache, and a more expensive one with 32mb cache....which is better? They have the same RPM and capacity.

Ive read that cache over 8mb is sufficient and doesnt matter much after that. Anyone have insight into this?

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a b G Storage
June 5, 2013 5:37:49 PM

Caching makes writes and reads faster once passed to Ram. If you can afford it you should always get a bigger Cache.
However the cache is not noticeable past the point where the data is being passed to the Ram.
So the question for you is what applications will you be primarily running?

If you're gaming then there's very little improvement from a cache size because the data is only loaded once and not constantly written to and from the hard drive.

Where as programs that constantly save and read data from the hard drive would benefit greatly from a larger cache.

I'm not saying games don't constantly load data to and from the hard drive but they do it at large amounts at big intervals when the data is needed or changed.

So your decision should be thought about the primary use of your computer or application of the hard drive.
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a c 525 G Storage
June 5, 2013 10:47:47 PM

KM75 said:
Ive read that cache over 8mb is sufficient and doesnt matter much after that. Anyone have insight into this?


I think you misunderstood there. It's not that more than 8MB of HDD drive cache doesn't matter, it's that more than 8GB of system RAM (with a 64bit O/S) is not needed for the vast majority of users.

Like Trent Quan-Sing said, get the HDD with the bigger cache.


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June 6, 2013 1:33:34 PM

Dereck47 said:
KM75 said:
Ive read that cache over 8mb is sufficient and doesnt matter much after that. Anyone have insight into this?


I think you misunderstood there. It's not that more than 8MB of HDD drive cache doesn't matter, it's that more than 8GB of system RAM (with a 64bit O/S) is not needed for the vast majority of users.

Like Trent Quan-Sing said, get the HDD with the bigger cache.

Actually you misunderstood what I said.

I meant what I wrote. Ive read people on this forum and others remark that over 8mb or 16mb, you dont notice cache size making a difference in performance.

I was not confusing this with ram. I know for most people 4gigs of Ram is sufficient, while many gamers use 8gigs. I myself have 16gigs of ram, but my system is not only for gaming.

I was simply referring to cache size in my OP for hard drives. I wasnt sure if Id really notice much of a difference between 16mb or 32mb. And lastly, is there anything over 64mb available at the moment? I havent seen anything over 64mb for mechanical drives.
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a c 525 G Storage
June 6, 2013 3:45:12 PM

KM75 said:
Actually you misunderstood what I said.

I meant what I wrote. Ive read people on this forum and others remark that over 8mb or 16mb, you dont notice cache size making a difference in performance.


I apologize for the confusion on my end.
I've never heard that having more than 8MB of cache on a HDD doesn't matter.

If you look at the Read/Write specs on a HDD you will generally find that the models with the fastest Read/Write speeds will also have the largest cache size.

For example, Seagate HDD models that Read/Write at 125MB/s have 16MB of cache.
The models that Read/Write at 210MB/s have 64MB of cache.
http://www.seagate.com/internal-hard-drives/desktop-har...

Western Digital HDD models that Read/Write at 126MB/s have 16MB & 32MB of cache.
The models that Read/Write at 150MB/s have 64MB of cache.
http://www.wdc.com/wdproducts/library/SpecSheet/ENG/287...

If the 16MB cache HDD and the 32MB cache HDD that you are choosing between both have the same Read/Write speeds then save some money and buy the 16MB cache model.
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