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It's all about maintaining an uncluttered system drive , imho .

I've been running system and apps - and user - on 80GB for years, still 30+GB available . That includes some fairly large libraries for C4D .

The secret is to either keep the user part seperate, or - even better - to not use iTunes, iPhoto and such .
 
I run Lion, FCP 7 and Motion 5 on a 120GB SSD

I imagine if I really started going to town on Apps, and installing 20 or 30 I never or rarely used, I would fill up my hard drive. But as it is, I use about 100GB for OS and Apps, and always keep 20GB free. I delete many unused or very rarely used Apps and don't install any unless absolutely necessary.

My Mac Pro is 3 times faster with an SSD, I would never go back to the old, spinning disc, archaic technology.
 
Mine hangs around 250GB as well. All data libraries (iTunes, iPhoto, etc.) are of course on a separate drive.

But I currently use a partitioned 4-drive RAID0 here... no SSD... so I should actually say a second "volume" I guess. The RAID gives me 40 to 60 MB/s for 4k files and 650 to 700MB/s for sustained transfers. Both rates are faster than a single SSD if it were connected via SATA III (which mac doesn't even have) and pretty close to the same as if two SSDs were striped in RAID0 - again if using SATA III.

It feels pretty nice. Boots are between 20sec. and 27sec. Something like photoshop with 45 or 50 plugins loads in like 7sec. Multi-layer 1080p video I/O edits very smoothly. and so on...
 
Short little blips are great on those hybrids if you need to only open your favorite apps fast. You need way beyond 8GB to actually act like a real SSD. The performance drop off of say a 20-40GB file transfer will be evident. Smoke and mirrors. Great for cheapskate that can't cobble their own together. I'd rather fusion drive a 128GB+ to a larger drive. You still will get the drop off but much later.

Even with only 4GB of flash, hybrids can turn a poor experience into a very good one.
 
My boot disk is a 256GB SSD, of which I use only 138GB.

I have Adobe CS5, CS5.5 and CS6 on it, as well as plenty of other apps, but what's great about having over 100GB of space on the boot disk is that I can conveniently drag large files onto my desktop for transfer or whatever (such as dumping photos from an SD card when the final target drive is unmounted) and be relatively unfazed by running out of space. I keep all my photos, films, music and other junk on a 4TB internal HDD.
 
Full SSD is the only way, dont waste your money on hybrids, they won't/can't ever be as fast.

Best bet is the Crucial M4, well it's the cheapest and the read/write speeds are more than you'll ever need. It's worth the money
 
It depends what you do. Most people waste money on a small SSD when a big hybrid would suit them as well.

It all comes down to what you can afford, if you want instant access, SSD, you on a budget and don't mind waiting, Fusion, you on an absolute budget...well you'll wait :p
 
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