I wouldn't use an SSD to record audio, because due to technical reasons they allow only a limited number of writings (but an unlimited number of readings) per memory cell.
IMO it doesn't make sense to use an SSD for every day recording, unless you record a really huge amount of tracks simultaneously.
Assuming a normal recording situation, I'd prefer a 7200 RPM HD for this purpose, but I'd record preferably into a multichannel file to avoid fragmentation which would eventually make the heads jump back and forth hence forcing the computer to wait until the heads are positioned to write the data to disk (assuming the cache is full). If using a multichannel file, it will be written continuously to the drive (assuming it has enough continuous space to write to, of course).
Using an SSD as cache is also a way I wouldn't prefer, due to the above mentioned reasons. I suspect these drives won't last long.
I'd use an SSD for purposes that don't use too much writing onto the disk e.g. system drive or sound libraries.
Also keep in mind that fast bootup time is not the only advantage of SSDs, it's only the most obvious.
-Data
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