Trying to do the math... (HDD related)
Hi,
I am putting together a new PC for editing and was wondering, how fast a HDD really has to be?! I read all the FAQ and understand, that there are plenty of suggestions out there, on how to setup your HDD's! However, I would like to be able to do the math myself and understand, why a given setup is recommended! If I take some 4K Cin footage of my GoPro Hero 3 BE, and enter the information here:
http://web.forret.com/tools/video_fps.asp?width=4096&height=2160&fps=15&space=rgb444&depth =10
(4096 x 2160, 15FPS, RGB 4:4:4 and 10 bits/color... I just picked something for demonstration purposes only) it tells me, that the Uncompressed bitrate is 497,66 MB/s.
If I now look at a chart like this:
http://www.tomshardware.com/charts/hdd-charts-2013/-01-Read-Throughput-Average-h2benchw-3. 16,2901.html
and pick a HDD, with lets say 150MB/s, what does this now mean?! The bitrate is clearly higher than the "speed" of the HDD. Does this mean, my playback is going to be jerky?! I believe so, but I am not sure what part a graphics Card plays here?! I also understand, that a slow HDD, can act as the bottle neck of a given system. So no matter how fast your CPU is, a slow HDD setup will slow the whole system down. But how fast does a HDD really have to be, so it doesn't slow the system down?! Is there some way to do the math and know in advance, what is going to work and what not?! Or is it as simple as picking a SD card for a GoPro?! If my video format delivers, lets say 500MB/s, I would need a SD card that is at LEAST this fast, so it can capture the video without dropping frames, right?! At least this is how I understand it, ha ha.
It must work a little bit different on a PC though, since the footage doesn't have to be captured in real time, correct?! A slow HDD is now going to just increase render times, right?!
G, I am so tired of trying to explain, what I mean, LOL. Hopefully all of this will make sense to someone out there?!
thanks,
KMD
p.s. Maybe it is really as simpe as just taking the bitrate for one track, adding all tracks up and whatever number comes up, your HDD has to be at least that fast, LOL?!
SAFEHARBOR11 wrote:
The 8-drive RAID reference was in regards to the "4:4:4 10-bit uncompressed HD" example that you offered. I sell those drives, part of my job, that is how I know. But this does not apply to GoPro footage, the above example is very rare, stuff Hollywood-types might use and not for you or I to worry about.
Black Magic Design has a drive speed test utility that you can run and it will tell you what video formats will work with your drive setup. There are also charts and tools out there, such as AJA Data Rate Calculator for PC or Mac, and now available from Apple App Store for iPhones - http://www.aja.com/en/software
Please note when playing with the calculator that if the format is "8-bit" or "10-bit" that references UNCOMPRESSED video, and you are not working with that. Since the calculator doesn't list the GoPro (Cineform) codec, not sure what the data rate is going to be, but much lower for sure.
Looking at the requirements for GoPro Studio Premium, they are recommending a 7200rpm unit, and fast connection if external, but nothing fancy so I wouldn't worry about needing any special drives.
Thanks
Jeff Pulera
Safe Harbor Computers
Jeff,
I am planning on using 4k in the near Future, so I need to worry about it, ha ha. The other thing is, a tool that measures my drive speed is useless for me, as of right now, since I do not have a system yet! Working on putting one together as we "speak". Anyhow, you pointing out the AJA Data Rate Calculator to me, is what made me realize, that I had the answer in front of me, the whole time!
http://web.forret.com/tools/video_fps.asp?width=4096&height=2160&fps=15&space=rgb444&depth =10
Either AJA or this site, will help me figuring out the data rate of most video formats... I have no idea why I didn't realize that the first time?! I read my OP and I want to delete it, ha ha...
Thanks again for all the help!
KMD
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Dell - Internal Use - Confidential
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Smash126Download:
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