KeithL
Administrator
Posts: 10,256
|
Post by KeithL on Nov 1, 2024 10:02:34 GMT -5
CFexpress was really developed for photography with modern cameras... In burst mode, when shooting RAW files, a modern Nikon still camera can pop off up to 20 pictures a second, at up to 50 mB each... And, when you do that, you need to store a huge amount of data really fast so you can shoot again... And, of course, something like 4k video, in a format that doesn't use a lot of compression, also has pretty extreme data requirements. However normal two-channel audio recording doesn't require anywhere near that... One thing I would note is that, when it comes to small hand-held devices, there are usually data bottlenecks at various spots in the signal chain. Because of this, you usually DO want to use the memory speed recommended by the manufacturer, or even a step or two above that... But you may or may not benefit from using significantly faster memory - in terms of the recording process. (But, as I said in another post, you may really enjoy that extra speed when dumping your memory card onto a computer...) Problem is I don't know how much SPEED you actually need on the memory end.....Some of the new SD stuff.....Video Rated.....can be fast. Several hundred meg / sec real write speeds.....CFexpress should double that. IF you need such capacity. But this IS funny to me. Boom was supporting and dealing with a 4 operating system music system. I don't know that turned out. I think SONY came up with it.....but right this minute? I Know that Nikon supports the format, but I'm unclear about anyone else.....or WHAT.
|
|
|
Post by leonski on Nov 1, 2024 14:47:11 GMT -5
right you are. At least in photography, you have all sorts of reasons NOT to achieve whatever speed the memory is rated for. Bus transfer? But cameras DO have a reasonable buffer so if you shoot faster than the memory allows, you CAN still be OK. Once shooting is done? Takes a couple seconds for the buffer to empty out into memory.....
My camera shoots about 30->35 meg RAW files in 12 bit or 14 bit color......For a casual walk at the Zoo? I can think of 1 place to use that.....when they do the Cheetah Run......over in a second. At a wedding? Bouquet Toss......But even for THOSE events? I will leave it on say......4 or 5 frames per second. This allows time to focus between shots. It's THAT fast..... Specs for my camera call out a 12 frames per second rate with a 43 shot buffer in RAW.....that's a LOT of data, since the buffer will transfer while shooting. Maybe 5 seconds or more at full-speed before it slows....... When I set it for 5 frames a second? Never an issue. Shooting a smaller file (JPG) bumps the numbers a lot.....
|
|
|
Post by vcautokid on Nov 2, 2024 11:08:28 GMT -5
With huge gantic files in imagery yeah and video too. But in my humble 2 channel world, the SDXC and CF is plenty. Many hours on the cheap. Would be cool if my Zoom to record to SSD too but hey, that would be too cool.
|
|
|
Post by leonski on Nov 2, 2024 13:51:46 GMT -5
Yeah, I see that stereo / Audio data rates are well within SD cards of today. I even have a pair of LEXAR 32gb Flash Drives which upon test ALSO work......
Looks like the real users of the kind of memory I own IS the photographer / videographer. Huge sensors and high frame rates are creating new needs.
|
|
|
Post by leonski on Nov 7, 2024 21:46:24 GMT -5
Vac? You JUST gave me an Idea. publishing here first is kind of like a registration..... Subject to MTBF of the drives?
Why NOT make a RAID drive out of Thumb drives? I see 256gb while 512 AND 1tb are also available.
This means that a RAID 5 drive could be made from 5 of these......And given the form factor? ANOTHER
RAID 5 with the other in a RAID 0 or 1 array. Have a pair of drives to back THIS thing up with or maybe
go cloud. Local backup is still best. Manufacturer calls it 'USB 3.2'
Wanna go in and see about feasibility / cost?
I don't know that they'd last long enough.....
|
|
|
Post by vcautokid on Nov 7, 2024 22:25:03 GMT -5
My old DX'ing days over 50 years ago. Just want to play around again.
|
|
|
Post by leonski on Nov 7, 2024 22:51:41 GMT -5
I have my GMRS and Ham (2m and 70cm) handhelds and a 10m unit intended for automobile. My SONY 2010 receiver needs some help, but is insane when working. From about 150khz to 30mhz. That's AM / SSB FM broatcast from 76->108 and Airband from 116->136 Might be a LITTLE large for backpacking. I'd love a SW receiver for my Computer...... On your new radio? Program in whatever of the NOAA Weather Radio channels you can get. I get 3, depending on where in county I am....I even get the one from the top of the hill on Avalon. www.weather.gov/nwr/stations?State=TNYou can look aroun 162mhz.....that's where they start. maybe 7 or 9 channels....
|
|