near instant access to timelines when using filmviewer is more than enough consideration for running AH on an ssd.
add to that the hundredfold reduction in latencies. but if you really prefer an HDD, get one with the bigger cache.
all apps in windows load like a dream too. no more waiting on a spinning hdd.
also, reads/writes occurs all the time, even when just browsing the internet(temp files).
ssd adoption 2 or 3 years ago would have come with glitches. (remember lack of trim/garbage cleaning?)
with win7, trim support is by default. and no more need for defragging too. ahci hotplugging is also an added useful feature.
if you dont trust ssd's that much yet, try a 32GB one, they come cheap nowadays.
it's more than enough for a dedicated win7 install(~18GB/64-bit version) + AH(w/ custom sounds/skins/maps/etc.)
if you use 32-bit win7, since AH is only 32-bit anyways, the install size is smaller, at ~14GB.
just back-up/clone/mirror your SSD regularly(i suggest mirroring the clean install, using win7's clone tool).
that way if your ssd fails, just use your backup while you warranty it.
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