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Disk usage while rendering with ffmpeg is hitting 100% most of the render. Cpu and ram though are only using half of what is available.
Would moving components to an ssd improve the operation time? And which components exactly would need to be moved to get the benefit? i.e. the ffmpeg.exe, the output files, the input files
Try using one disk for source material and a separate disk for the rendered video output.
There are lots of different SSD disks - cheap MLC ones, and more expensive but faster SLC ones.
If using RAID, there are several types. RAID5 and RAID1 probably won't be faster. RAID0 (striped array) is intended to be faster than a single disk.
What interface are you using? If you are using it as a removable drive, have you changed it to allow write-behind caching? (This allows the computer to move on while the drive is still writing the buffer to disk)
If you have that option of moving to SSD there's no better way to find out if it improves, other than just trying to see if it does.
That said, input and output files on the SSD should greatly improve read and write speed. Moving the exe is less of an issue since its commands aren't demanding and are usually cached in memory (RAM).
An SSD has a faster read and write-speed compared to HDDs. However, if you're looking to use a drive for years, you should rather opt for an HDD. Reason is, that SSDs wear out over time and are definitely not made to last years on end. Additionally, HDDs give you an idea when their demise is inbound, because they make nasty noises when the time has come, giving you the opportunity to save and backup your files. SSDs don't care about your feelings and just die at some point.
If the money aspect is not your greatest worry though, going for an SSD will improve the speed with which you operate due to the higher transfer-speed. In your case, I would go for a 1-2 tb SSD on which you run your os and keep files that you're working on right now. Additionally, I'd buy like 5-10 tb as an HDD to keep the files I'm done with or didn't start yet.
