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Please help me choose a microsd card.

Posted: Tue May 10, 2016 5:21 pm
by dome77
Hello. First time poster here.

I am in the process of getting the peripherals needed for the RaspPi 3 which I have yet to order. I am having trouble purchasing the 8 gb class 6 microsd which the Pi people recommend. So far most cards on ebay are either class 4 or class 10. In looking at data which experienced Pi users have produced concerning size and class of microsd cards, I am totally baffled.

Can someone make it simpler for me, please. As a beginner who will probably start by doing web surfing, watching youtube videos or LibreOffice Writer, which size and class would be most suitable for me and the best buy for my money?

Re: Please help me choose a microsd card.

Posted: Tue May 10, 2016 5:51 pm
by gordon77
I use SanDisk ultra type 10, 16 or 32GB, no issues

Re: Please help me choose a microsd card.

Posted: Tue May 10, 2016 5:52 pm
by dom
Samsung EVO/EVO+ would be my choice. Very fast. E.g. this.

Be a bit careful of buying on eBay - there are a lot of fakes about. I'd trust Amazon (not Amazon marketplace).

Re: Please help me choose a microsd card.

Posted: Tue May 10, 2016 5:57 pm
by Rive
dom wrote:Samsung EVO/EVO+ would be my choice. Very fast. E.g.
Image
Second this. $11 at Bestbuy (in US) 32GB EVO+ UHS-1/HC-1
40MB/s read, 20 MB/s write speeds if you overclock it using:

(that means it is very fast) ;)

/boot/config.txt

Code: Select all

dtparam=sd_overclock=100
Speed results:

Code: Select all

[email protected]:~ $ sudo ./sdbench.sh
[3;J
CONFIG: 
CLOCK : 100.000 MHz
CORE  : 500 MHz, turbo=1
DATA  : 512 MB, /root/test.dat

HDPARM:
======
 Timing O_DIRECT disk reads: 126 MB in  3.01 seconds =  41.86 MB/sec
 Timing O_DIRECT disk reads: 124 MB in  3.03 seconds =  40.89 MB/sec
 Timing O_DIRECT disk reads: 122 MB in  3.02 seconds =  40.40 MB/sec

WRITE:
=====
536870912 bytes (537 MB) copied, 25.5738 s, 21.0 MB/s
536870912 bytes (537 MB) copied, 22.3328 s, 24.0 MB/s
536870912 bytes (537 MB) copied, 23.7269 s, 22.6 MB/s

READ:
====
536870912 bytes (537 MB) copied, 12.8048 s, 41.9 MB/s
536870912 bytes (537 MB) copied, 12.3227 s, 43.6 MB/s
536870912 bytes (537 MB) copied, 12.3561 s, 43.4 MB/s

RESULT (AVG):
============
Overlay config                      core_freq   turbo   overclock_50    WRITE        READ        HDPARM
                                       500        1     100.000 MHz   21.51 MB/s   40.99 MB/s   41.06 MB/s

Re: Please help me choose a microsd card.

Posted: Tue May 10, 2016 9:40 pm
by dome77
Thank you for all those responses. Based on your recommendations, I will be purchasing from Amazon.