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Class 10 SDHC Cards- Newbie Qs

Fri Mar 20, 2015 3:41 pm

Hi All!

I'm wondering what experienced folks are buying for the cards in their new Pi 4-bangers...

Are they sticking to 8 G Class 4 cards? How full are they after a few months?
Are there power consumption or partitioning issues with the larger capacity cards?
Do the faster Class 10 cards confer any real advantages? Are they fully compatible?

The Class 10 cards seem to be dropping steeply in price, and I'm guessing users keep their cards for the long-term (like HDs).

If there's a smarter question I didn't think to ask, please lemmeno the answer! :shock:

oh ps, I'm already wondering about a future on-board dual socket to hold 2 cards; is that a feasible hardware feature?

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Re: Class 10 SDHC Cards- Newbie Qs

Sat Mar 21, 2015 3:44 am

There are some data types which some class 10 cards are not as fast with (when compared with the cards chosen which include Pi OS's). In addition, to keep the price of the Raspberry Pi low, the hardware does not match the capabilities of some higher grade cards (such as the SanDisk Extreme Pro which can top 90 megabytes per second). Higher grade card interfaces and processors would have pushed the price up well beyond the $35 current price point. But, there is no harm in having a card which you could later swap for another purpose at which it could live up to it's potential top speed (meaning using it in a camera, camcorder, cellphone or otherwise).
As for secondary cards and so on, it is usually cheaper to buy a much larger USB drive than a very large SD or MicroSD capacity card. Add the larger USB drive to any USB port you choose, and you've substantially increased the Pi's storage space (it will show up as a storage option for most programs). Or, buy a USB hard drive or a USB to SATA adapter and a large SATA hard drive and plug it into a powered USB hub (otherwise it's power-current requirements may be too great for the Pi's USB ports).

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Re: Class 10 SDHC Cards- Newbie Qs

Sat Mar 21, 2015 10:44 am

As a newbie you won't be able to tell the difference between class 4, 6 or 10.

Class 10 are designed for big bursts of data (multi-megapixel photos) being written to the card and slow read.
Class 4 are designed for lots of small files being read and written with optimal performance for read.

Your Raspberry Pi more closely matches the class 4 profile. Media centres need high performance read if the media you're playing is on a SDCard (it shouldn't be on an SDCard, move it off to a USB hard drive if it's a problem).

You won't notice any difference at all until you start moving great big globs of data in a time critical process. Apart from media playing there's very few folks doing that.
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