This depends on your project sizes. You can get a software raid and stripe the data on both disks. That will give you a faster performance in general but if one HDD breaks down all your data is most likely gone because the files are being spread between the two HDD. Also you should best stripe Raid with two identical HDD.
What I would do in your case is either buy a 2nd Seagate HDD and stripe these two that gives you higher performance when editing. Use the WD as a System drive.
OR (if you don't want to spend extra money)
Install your system and applications on your WD. Only the stuff that can be reinstalled anytime.
The other Seagate can be used as your work drive and you can keep both HDDs nicely seperated. Backing up Work or your system without too
many "Trash files".
[Moved to Hardware forum.]
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First is 1 TB WD Green with 5400-7200(dynamic) RPM 32 MB - good for safety, and second is a Seagate 1 TB 7200 RPM 64 MB - performance ready.
The 'Green' runs at 5400. Nothing dynamic about it. It is unsuitable for an editing machine. It is OK for backups.
So you are left with ONE usable disk. That is not enough. You need at least two, but better three separate 7200 disks.
The seller said that it increases RPM dynamically when usage grows up. May be I missunderstood something. I'll check, thanks.