Class 10 SD vs Class 4

[pteeson]

Since I will install Raspbian Jessie and I will have to get a new micro SD card for my hand me down Pi2 to replace the broken Kingston 16GB Class 10 that came with it.

I searched the forum and all I can determine is that Class 10 is for very frequent R/W whereas Class 4 is for infrequent R/W. I don't plan to run a web site or anything like that. Just have fun going back to bare metal again in my retirement.

Is there any reason why I should not get the Class 10? (Price is not an issue.)

respect

Peter

[allfox]

Greetings.

I was told that SD Class is only meaning for writing speed. So I think Class 10 wouldn't make things running faster, reading speed is what cares.

Those fast writing card is for application such as a camera, so that it could write the new photo to memory faster. And this kind of writing often means writing a big block of data in a single request, that's just not a Pi would do often.

I would suggest that you could get a small Class 4 card, then get a hard disk. Set up the card loading OS from the hard disk.
Good part: hard disk is more stable than flash memory. They seldom wear out, well, I'm quite young and only see once such case. Hard disk could have huge space, saying 1TB or so.
Bad part: hard disk need a physically moving mechanical part to work, so it's noisy.

[rpdom]

In the past the Class 10s have been faster at large continuous reads and writes, but not so good at many small random writes. While the Class 4 and Class 6 cards have been faster at the many small writes. Guess which the Linux OS tends to use the most?

Some Class 10 cards now seem to have better small read/write speed. I'm guessing they have better internal buffering/caching now.

I used to say go for a Class 4, but you might as well go for a 10. The official NOOBS card I got from the Swag store is a C10 and seems to work ok (although the version of NOOBS on it was a bit old).

[FTrevorGowen]

...
The official NOOBS card I got from the Swag store is a C10 and seems to work ok (although the version of NOOBS on it was a bit old).

Interesting ... they used to be Samsung Class 6 (which, IIRC, were the ones found to "work best" with the "older", ie. pre-P2B, Pi's). Certainly those I've purchased were:
http://www.cpmspectrepi.webspace.virgin ... cards.html
Trev.

[rpdom]

...
The official NOOBS card I got from the Swag store is a C10 and seems to work ok (although the version of NOOBS on it was a bit old).

Interesting ... they used to be Samsung Class 6

The actual card is a SanDisk one. I could post a picture if you like.

[FTrevorGowen]

...
The official NOOBS card I got from the Swag store is a C10 and seems to work ok (although the version of NOOBS on it was a bit old).

Interesting ... they used to be Samsung Class 6

The actual card is a SanDisk one. I could post a picture if you like.

Similar to my 'Q' perhaps? (Although mine, w/o NOOBS, were purchased elsewhere**, IIRC, Farnell were supplying that type ...)
Trev.
** The first for use in an Android tablet.

[rpdom]

Similar to my 'Q' perhaps?

It looks more like your 'L', but the text in the bottom right is something like

MicroSD
HC I
U1 C10

Obviously with the appropriate symbols rather than the text.