Best SD Card for an R16

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tonybonta
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Best SD Card for an R16

Post by tonybonta » Sat Dec 09, 2017 2:52 pm

So I'm wondering if there's an updated list for approved SD Cards for the R16. The list below is over 6 years old. I'm looking for the fastest card with the most storage.

https://www.zoom.co.jp/sites/default/fi ... _cards.pdf
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Wulfraed
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Re: Best SD Card for an R16

Post by Wulfraed » Sat Dec 09, 2017 7:43 pm

"Most storage" is the easy part... The R16 can NOT use SDXC cards, and SDHC tops out at 32MB.

For the most part, any of the higher end cards -- SanDisk, Lexar, should be usable.

Take note, however, that when the cards are rated, Class-10 cards are based upon streaming a single (video) file onto a freshly formatted card. It is possible for the cheaper Class-10 cards to have very poor performance when using smaller multiple fragmented files, whereas a Class-6 or even -4 performs well (Class-2/4/6 are rated for fragmented/small files -- what one would encounter on a still image camera with deleted images). Recording 8-parallel tracks means having 8-open files, and many -10 cards will have to reallocate memory blocks as they switch from partial file to partial file (even top end -6 cards may not be able to handle 8-parallel but they tend to allow for 4-6 open "allocation units" whereas a cheap -10 may only handle 2 open "allocation units". Each time they go to write to a different file, if that file is not in an open allocation unit, the card has to close a unit, find a new/erased unit, open it, copy the partial from another allocation unit, then copy the new data and erase the old allocation unit).

Caveat: this is my understanding of how the cards work -- it may be that the 8-parallel can write to 8-sectors within one allocation unit. If so, a card with fewer open units could still keep up.

The other thing to take account of is that "xSpeed" is based upon stereo CD (2ch 16-bit/44.1kHz) transfer rate. a Class-2 card is roughly the equivalent of 13X CD and should thereby be capable of handling the equivalent of 26 channels/tracks in parallel. So... Even a class-2 card should be able to handle a fully loaded R16.
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tonybonta
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Re: Best SD Card for an R16

Post by tonybonta » Sun Dec 10, 2017 1:47 am

thx Baron... very helpful
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sciurius
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Re: Best SD Card for an R16

Post by sciurius » Sun Dec 10, 2017 4:01 am

Wulfraed wrote:
Sat Dec 09, 2017 7:43 pm
The R16 can NOT use SDXC cards, and SDHC tops out at 32MB.
According to the manual, this applies to the newer R24 as well.
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