First, skip RAID 0 for now.
Second, put the OS on the Sandisk, projects and cache on the Seagate, and media and exports on the Toshiba.
Third, pick up an external for backups.
Once that's done, you can work towards adding more drives to reach the following basic configuration.
Once you have those five in place (plus a backup), then you can think about adding RAIDs. I'd recommend RAID 0 only for E and G, however. Use RAID 1 for C and D, and RAID 3 for F.
When you say media on the Toshiba you mean the files which my project is built from, right? shouldn't it be a fast drive for that? I can afford another Hdd or two and would prefer to spend that money if it gets me the extra speed. as I said I'm working with large AVCHD files (From my panasonic AG-130).
Why don't you recommend Raid at this point ?
(Sorry for my English, not my native language...)
You're fine with a single drive using that media. Your CPU will stumble before your hard drive does.
If you have the funds for extra drives, start with the backup, then add the Export drive, finally the Cache drive. That will spread the load out pretty evenly and offer good performance.
The array you've suggested works very well, thank you. I just received a 1TB WD Velociraptor and about to receive another 3TB Toshiba next week, and wondered what are the right changes for best performance.
The current array is
OS- Sandisk SSD 240GB
Projects and Cache- Seagate Momentus 750GB
Exports and media: Toshiba 3TB.
What part of the projects requires fastest access to which I should assign the WD Velociraptor?
I'd probably leave the Projects on the 750GB, move Cache/Scratch over to the Velociraptor, and make the forthcoming 3TB an Export drive.
I am using a Z77 mobo, do you think that buying a cache SSD and using the "Smart Response" technology for the Toshiba Media drive could make a difference ?
I don't know enough about Smart Response to comment.
The SSD caching works but really is a waste of an SSD drive unless you only have a small 1.