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WD Blacks, AAKS vs AALS

post #1 of 32
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I remember from reading awhile back that the AAKS were the drives with the denser platers, or something like that, and were faster. However, these AALS drives appera to have double the cache (32mb vs 16mb). Are these newer drivers faster than the old AAKS?

And what's the deal with 500gb vs 640gb? I'm assuming the 640gb is better because it uses the dual, denser 320gb platters?

I'm looking at this one for possible short stroke and RAID 0 (both of which I also need help with) to hold me over for another year until SSD prices come down. Is this not a good idea?

http://www.newegg.com/Product/Produc...82E16822136320


Forgive the newbness, I don't know much about hard drives.
    
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post #2 of 32
Don't quote me but I believe both of the 500/640 use two platters. 250/320 respectively. As for which one is faster, the more cache the faster it'll be. I personally have two 500GB Blacks (AALS) and they're quite fast. RAID/short stroking would even more so improve performance.

If you want the best of both worlds (SSD/HDD), get one of the new hybrid drives. I hear they're pretty fast.


EDIT: And yes, the AALS are faster than the AAKS versions because of the larger cache.
    
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post #3 of 32
Quote:
Originally Posted by GanjaSMK View Post
EDIT: And yes, the AALS are faster than the AAKS versions because of the larger cache.
Not true at all. Unless you have a very specialized application, cache size will result in no difference in performance.
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post #4 of 32
I was about to ask this same question, my current drives are AALS and noticed a nice pair of AAKS in the FS section and was curious as to which ones were faster in raid 0.
post #5 of 32
This thread is from over a year ago recommending the AALS over the AAKS.

Also, the larger cache isn't the only improvement on the AALS drives, but is part of why they are faster. Show me a link disproving that?
    
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post #6 of 32
Because the cache doesn't really do a whole lot performance-wise. Drives with denser platters or more platters have more cache because they need it to cache the data in each cylinder. The larger cache is a result of the higher platter density, but the higher platter density is the reason for the higher speed.

If more cache really made drives faster, do you really think manufacturers would still be releasing drives with 16 and 32MB of cache memory? Take the fastest mechanical drive around right now - the Seagate Cheetah 15K.7 ST3600057SS. That drive, although capable of over 170MB/s, has 16MB cache. Still think cache = performance?
post #7 of 32
Quote:
Originally Posted by GanjaSMK View Post
Also, the larger cache isn't the only improvement on the AALS drives, but is part of why they are faster. Show me a link disproving that?
Ok-dokey: http://www.tomshardware.com/reviews/...ce,1557-7.html
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post #8 of 32
Quote:
Originally Posted by eflyguy View Post
Not only does that show that more cache doesn't improve performance, it even shows that the SATA drive with the extra cache is slower than the same drive with half the RAM onboard (although the results are not exactly statistically significant...).
post #9 of 32
The 640GB use 320GB platters, the 500GB use 250GB platters.

But the AALS WD Blacks are better than the AAKS WD Blues.
post #10 of 32
I stand corrected.
    
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