HDD and SSD Questions for video editting and gaming purposes

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I am a certified drone pilot. I am about to enter the world of video editing. This will be a new field for me, so I do not have any video specifics such as framerates or compression except that I plan to shoot video in 1080p and possibly 4K for clients by doing drone services such as structural inspections. I have a gaming PC that I am planning to reconvert for both video editing and gaming. I am considering the Intel i7-8700K Coffee Lake CPU along with an appropriate motherboard and RAM. However I have some questions about selections for the HDD and SSD.

My current build has a 1TB Samsung 850 Evo SSD and two 2TB 7200 RPM Seagate Barracuda HDDs. I plan to purchase a sufficient sized external hard drive to back up the drone videos regardless of the recommendations to my questions.

On the matter of the HDD, my first question is how big a hard drive, in terms of storage space, should I purchase for both 4K and 1080p video? Also, would 7200 RPM be a sufficient speed? I was considering for cost saving purposes both storing and running video for editing off of an external hard drive. My current external hard drive uses a USB 3.0 connection. Would a USB 3.0 connection be capable of properly transmitting video from the external hard drive to the computer for editing in either 1080p or 4K or should I consider using an internal hard drive via SATA connection?

I am considering the possibility of either replacing my Samsung 850 Evo with an alternative SSD, or installing a second SSD. Are there any reliable alternative SSD models and brands that you would recommend that are just as capable of handling PC gaming and video editing for a lower price? How much of a difference in real world performance would I notice between the two SSDs? I am looking at 1TB SSD models, however, I have not selected a video editing software package yet. Would a 1TB SSD be sufficient in terms of storage space for video editing software with plenty of room to spare for the OS and other software (for printer, GPU, sound card, and video card) or should I move up to a 2TB SSD? Thanks.
 
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A hard drive will be fine for simple video editing (1 or 2 video sources). However, if you plan on combining several large format (4k) video sources into a single edited video file, then an SSD would be highly recommended instead of a HDD.

For storage purposes, I recommend spending as much as you can afford on a setting up a RAID 1 in your PC, or getting a NAS in RAID 1 configuration. For example, I just started looking for a relatively simple NAS that I can configured as RAID 1 (mirror) and is able to store 8TB of data. Basically that means the NAS will have two 8TB hard drives and data is duplicated on both hard drives to provide redundancy. Should one HDD fail, then you still have the data other HDD to recreate the mirror. Of course...

SoggyTissue

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you should know that when youre editing video, it is normally kept in RAM ... make sure you got 32+ GB <3

hard drive transfer speeds dictate how quickly the video will load from the drive, to RAM (with a little drive streaming). and obv how quickly it gets saved.
now the technical stuff:
4k bit rate is 30-40 Mbps at 30 fps
4k bit rate is 50-60 Mbps at 50fps

a normal hard drive wont (generally) be able to deliver the 50fps rate if youre wanting to stream view off it.
hdd 20 Mbps
ssd 200+ Mbps
m.2 ssd 500+ Mbps

but like i say, for editing, it normally gets put into RAM, so its more about load times and save times. and so i would always reccomend a fat drive to host the videos. some would prefer ssd speeds to be able to work on their videos quicker.

Depending on how many videos you will be wanting to keep on the computer = size of the fat hdd ... 2+ TB would be a good start. i recomend 3 so that you got plenty of space for the forseeable future.

usb3 is rated at 70-90 Mbps? that exceeds the rate it takes to stream 4k at 50fps. - check external drive transfer speeds over usb3.

having a 1TB ssd for video editing would be a good idea, but remember that performance will decrease the 'fuller' it becomes. not really a problem as it will still be faster than a normal hdd. also (and i know there will be haters) enable pagefile on the ssd. shorter life obv, but video can and will be cached at some point, and best it is cached to ssd.
 
A modern HDD will fully be able to deliver more than enough for a 4K 60Hz stream. A modern 7200RPM HDD will typically deliver between 80-150 MB/s in sequential throughput. And large video files are sequential loads. Sata SSD will typically deliver 400-500 MB/s in sequential throughput.
 
A hard drive will be fine for simple video editing (1 or 2 video sources). However, if you plan on combining several large format (4k) video sources into a single edited video file, then an SSD would be highly recommended instead of a HDD.

For storage purposes, I recommend spending as much as you can afford on a setting up a RAID 1 in your PC, or getting a NAS in RAID 1 configuration. For example, I just started looking for a relatively simple NAS that I can configured as RAID 1 (mirror) and is able to store 8TB of data. Basically that means the NAS will have two 8TB hard drives and data is duplicated on both hard drives to provide redundancy. Should one HDD fail, then you still have the data other HDD to recreate the mirror. Of course if both hard drives fail at the same time, then you are screwed. That where more expensive and complex RAID 5 and RAID 10 configurations come into play.
 
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