1. D: would need the highest throughput to accommodate the video. (This is why I advocate for a fifth Media drive holding only camera media. Make it large, make it fast.)
2. Still D: because that's where the media is.
The heaviest sustained read/write work (according to all tests done by the Guru of such, Bill Gehrke ) shows the highest demands for read/write are typically the cache files (media cache, media cache database) and the project files, then the program file, then the media.
Until now, separating all those on separate storage media was pretty much required, though now with the vastly higher sustained read/write of some (not all!) NVMe and m.2 drives, then most newer internal SSD's, and then the Samsung T3 external SSD via a USB3 connection, his recommendations for number/types of storage media are changing rapidly.
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Get modern and start using SSD's.
Hard disk drives have read/write rates from 200 MB/second to 50 MB/second.
SATA III SSD's have read write rates from 550 MB/second to 400MB/second.
USB 3 portable SSD's like the Samsung T3 have read/write rates of 440 MB/second to 400 MB/second.
M.2 PCIe Gen 3 x4 SSD like a Samsung 960 Pro has read write rates of 3500 MB/second to 2000 MB/second
With these much higher read/write rates it is no longer necessary to have 4-5 hard disk drives.
Test your disk drives with something like HDTune and see how they slow down versus amount of data on the drive, here is an example with a small slightly older (500 GB) drive. SSD's do not slow down as they fill up
I'm sorry ... about C: and D:, I was trying to point out there are no programs nor documents on the Project/Footage and Scratch and Resource Media drives.. Was trying to get an opinion about which drive, between E, F and G ... in this scenario, might get hit the most.
I purchased an SSD for my boot drive a couple years ago. I just bought another 1TB SSD to use as a scratch Drive. But, I'm trying to decide if it's better utilized for when I render out files instead.
On my current setup:
My E is RAID 1 with Projects/Footage to safeguard the projects and footage (7200 RPM Cavair Black 4TB each)
F: is currently Scratch and where I render to and is 2x2TB Caviar Blacks RAID 0 for a total of 4 TB storage
But, since I got another SSD, I'm trying to decide the best strategy.
Thanks again, for any advice
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.....you are behind the times......read what Bill wrote about the current SSDs vs. traditional spinning, mechanical hard drives.
for much better performance do NOT use ANY spinning hard drives in any active video editing,or, rendering......they can BEST be used as backup drives,or, archive drives.
Bill's tests have shown that you would want to have OS,programs, and Windows page file ONLY on your SSD boot drive. However, Bill's tests ALSO show that the "media cache" and "cache" files may stay on the boot drive, ( their default location), without any penalty in performance.
ALL other files : ( i.e. media, project files, previews, exports,etc.) would go on a second quality SSD....like a Samsung 850 Pro.
For BEST performance, that second SSD would be the Samsung 960 Pro PCI NVMe SSD. Again, the spinners would just be for backing up files,or, archiving projects and media,etc., they are just TOO SLOW for today's editing, especially with the more demanding 4K footage.
Thanks for the advice, Simon
Thanks for that detail, JFPhoton
Everyone gave such great responses ... I don't know who to allocate Correct Answer to :-)
Since all the excellent responses were based on Bill Gehrke's research, I gave him the "Correct Answer" to my question.
Where I used to go to bed once I started a render of a full-length movie, I rendered a 2 Hour movie yesterday that took two hours to render. Game changer, for real. :-D
Thanks again, everyone!