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JVC 4K Pro Handheld Camcorders
GY-LS300, GY-HM200, HM170 and HM-Q10 recording 4K Ultra-High Definition video.


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Old July 15th, 2016, 10:02 AM   #16
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Re: LS300 SD Cards for 4K

Quote:
Originally Posted by B.J. Adams View Post
isn't 90Mbytes/sec an overkill?
For recording yes, but when you are pulling data off the SD card the faster the better!
As long as your card reader etc can utilise the faster read speeds.

I have three SD card cases that contain 8x16GB, 8x 32GB and 6x64GB plus I've got a few spare 16GB and 32GB cards. All from Transcend.

I use the 16s and 32s in my EX1 and FS100 and the 64s in the LS300.

They've always been reliable in terms of data. And although I've had a few 16GB cards start to split, they were all replaced by Transcend UK.
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Old August 17th, 2016, 02:57 AM   #17
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Re: LS300 SD Cards for 4K

Just tested Samsung Pro SDXC cards rated 80MB/s write. Did not want to accept them with 4K 150Mb bitrate. At 70Mb bitrate seems to accept them ok.

What a pity these cards were on sale and I got 2!

I think I have to stick with the suggested brand of cards right for 4K 150Mb bitrate?
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Old August 25th, 2016, 01:12 AM   #18
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Re: LS300 SD Cards for 4K

I had recently a dialog with JVC support in UK on this and here is their answer:

Q- "The Sandisk 64GB SDXC Extreme 90MB/s UHS-1 Klasse 10 card seems to be sufficient in speed while the user guide requires the 280mb/s card. I have filmed HD, 4K and HD 120 f/s on the 90MB/s card. Should I expect issues using these cards?"

A- "This is due to the difference between Bits (b) and Bytes (B) and there are 8 bits to 1 Byte
SD cards are normally labelled in Bytes per second (MB/s) and camera record data rates are in bits per second (Mb/s).
So actually the 90MB/s = 720mb/s and by far exceeds the camera requirement of 280mb/s."

As an old pgmr I knew these details but the mb/MB difference was not obvious to me in this case.

I pointed out that the guide could be somewhat clearer here.
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Old August 25th, 2016, 01:17 AM   #19
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Re: LS300 SD Cards for 4K

I have a Transcend 64GB card that writes at 30MB/s when tested on a USB 3.0 adapter. It works fine at 4K @ 150mb/s

I have a Samsung Pro 64GB card that writes at 50MB/s when tested on a USB 3.0 adapter. It works fine at 4K @ 70mb/s but NOT at 150mb/s

I think the LS300 is somehow checking the card make and comparing against an internal list of supported cards.

Can't find a contact number for JVC to put forward this issue
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