Micro SD cards class 10 ?

Efour · 12 Mar 2012 at 18:49

I know very little about this except what ive read on Wiki.

Ive bought a 16gb one and its max transfer is 3,8MB a second... 22 minutes to copy 4gb to it ..

I thought these things, class 10, had a transfer rate of 10MB (over a USB cable)

Have i totally misunderstood this?

Yeah its trivial just annoyingly slow.

panyan · 12 Mar 2012 at 18:51

how are you connecting it to the computer?

i find that if i do it through my phone to the SD card, it is MUCH slower than a usb adapter

Efour · 12 Mar 2012 at 18:56

its in the device.

ill try it in an adapter thx.

Also I re-read what i wrote and ive been dumb

read speed not write speed... still its slow

Efour · 12 Mar 2012 at 19:03

17.5MB now haha ok thanks.

philds · 12 Mar 2012 at 19:06

Ignore the classes on memory cards as it's not governed by any authority so companies can put whatever class they like on the label. You just have to look at the read/write speeds and see if they are fast enough.

marms · 12 Mar 2012 at 20:16

philds said:
Ignore the classes on memory cards as it's not governed by any authority so companies can put whatever class they like on the label. You just have to look at the read/write speeds and see if they are fast enough.

The speed class is the minimum write speed as defined by the SD Association. if a card can't support it's rated speed it should be returned as faulty.

https://www.sdcard.org/developers/overview/speed_class/

panyan · 12 Mar 2012 at 20:27

philds said:
Ignore the classes on memory cards as it's not governed by any authority so companies can put whatever class they like on the label. You just have to look at the read/write speeds and see if they are fast enough.

-1

marms said:
The speed class is the minimum write speed as defined by the SD Association

+1

RooBoonix · 12 Mar 2012 at 21:20

How come they are slower when inside a device? I really need to get me one of these SD to USB adapters

jakspyder · 12 Mar 2012 at 22:43

One would assume the device doesnt have the CPU power to transfer that quickly. Or at least, not the power where it counts, it being more specialised to its specific role.