[Q] Micro SD, which one?

[dragoncius]

Hi,

I want to buy a 32 gb micro sd for my Atrix, but I see there are different Classes....

I saw in TheCellGuru a 32 gb Class 2 for about 75 bucks. But I remeber I had a Class 4 8gb, so what is the difference?

Can my Atrix read any 32gb card? Should I look for another one?

Thanks!

 

[neer2005]

The higher the class the faster the SD card.

Sent from my MB860 using XDA App

 

[dragoncius]

Thnx. But can Atrix read any class? What class should I get?

 

[lunzi88]

Thnx. But can Atrix read any class? What class should I get?

if you can live with the slower speed, den the 32gb is fine.

 

[dragoncius]

But whats the deal with speed? Does it affect performance on the phone or just data transfer time when moving files to and from the micro sd?

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[erick161]

IIRC, class speed also affects how fast the SD loads on your phone.

 

[dragoncius]

Thnx. So, lets say I never turn off the phone, and the sd card will load only once, getting a 2 class sd isnt a bad idea. Am I right?

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[dragoncius]

Can someine confirm if Atrix supports Class 6 32 gb micro sd?

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[neer2005]

Yes an ATRIX will support a class 6 32gb SD ( finally moto adds ATRIX as a word in their keyboard lol)

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[_kansei_]

The higher the class the faster the SD card.

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Slight correction: the higher the minimum speed guarantee. A class number defines the absolute minimum write speed of an SD card. Devices can read the class from the card and with that can set some expectations in the software for how long things should take.

So with that, there are Class 2 cards that actually, out of the box, perform better than cards with a much higher class. Will they forever, once worn and fragmented? Maybe not.

It's all very vague, exactly what the manufacturers want

 

[Mgamerz]

I had a class 2 8GB card and now have a class 4 32GB card ($45 on amazon with their goldbox deal, kingston) and the class 2 is like 2 mbps faster than my class 4... maybe i should have gone with the class 2...

 

[Careca_RS]

I have a Lexar 32Gb class 10, it's working despise of some bad comments around it, so far, so good. The class of the card is about the reading speed - the higher, the better (in theory).

 

[vanstorm]

I have the 32g class 10 lexar but it failed on my once and I needed to reformat it. If I had to by another one I would stick with sandisk. They are pretty solid.

 

[kdoodle]

Generally class determines the speed of Read and Write.

Class 4 is usually the minimum requirement for HD recording as it requires faster writing abilities.

Not all microSD have the same speeds as each company varies with speed even if they are the same class. Some class 4 could actually be faster than class 6.

Beware of fake microSD as usually that may be one of the reasons that it could be slower or even die out within the first week of usage.

I would recommend using SD Tools in the market place as soon as you receive your card.

https://market.android.com/details?id=ales.veluscek.sdtools&feature=search_result

Just be patient with the deals, there's always a lower price.

 

[_kansei_]

The class of the card is about the reading speed - the higher, the better (in theory).

Write speed, not read speed. The whole "class" thing is confusing enough without people giving incorrect information. Sorry to be so pedantic.

Here it is direct from the source (PDF): http://www.sdcard.org/developers/te...lified_Specification_Ver3.01_Final_100518.pdf

Also from the source, a simplified overview: http://www.sdcard.org/developers/tech/speed_class/

Class is based on write speed because SD cards (well MMC) of course were originally conceived of for use with digital cameras and camcorders, where write speed is critical, but read speed much less so.

 

[Careca_RS]

Write speed, not read speed.

Yeap. That's what I meant.

Thanks for the correction

 

[dragoncius]

Thabks everyone! I will wait and be on the look for a nice deal. Thnx!

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[_kansei_]

I just tested my 16GB class 2 MicroSD (Patriot brand, off newegg) that i've had for a year or two. The minimum write speed during the benchmark was 10.5 MB/s, i.e. Class 10 speeds. Read speeds were 16MB/s. I'm pleased

Since there's a high variance, all you can do is buy a card based on brand reputation and the class rating and hope that it's actually faster than the class suggests. Does it need to be faster? I dunno, I only use my card for media storage.

 

[Souai]

I had a class 2 8GB card and now have a class 4 32GB card ($45 on amazon with their goldbox deal, kingston) and the class 2 is like 2 mbps faster than my class 4... maybe i should have gone with the class 2...

greetings, im new to the forums (and the atrix, only had this baby for two days now), but i can shed some light on the matter.

with the microSD cards, the class tells you the minimum write speed. class 2 = 2mb/s minimum. class 4 = 4mb/s minimum. hence your class 4 is meant to be 2mb/s faster than class 2.

at the moment, i use a class 10 16gb from kingmax. for the most part, most people wont notice the difference between most classes, but if you want to take lots of photos in rapid succession or if you plan to film 720p footage directly to the SD card, or even if you watch really large videos, its generally better to go for a higher class.

sure, you can still take a 5-8mp photo and save it to a class 2, but at class 2 speeds, it would take ~1 second for the photo to save. on a class 10, it takes ~0.2 seconds for the same photo to save (assuming all else remains the same), which can come in handy for quick snaps. but given the amount of ram we have on the atrix, i'd assume it would buffer to ram first and copy later so it wouldnt be much of an issue.

 

[ParrotSquawk]

I took a chance....

I took a chance and bought some Chinese 32GB cards supposedly rated for Class 10.

I ran a test on one of the cards , placing it inside my phone, using SD tools (from the market)
It reported write speeds of 4.0 MB/s and read speeds of 5.3MB/s. In theory that's about a class 6 but there are supposedly latency issues that creep up as the cards get larger.

I need to compare that number to known cards before I say anything about the source. I'd be curious to see test results from this app on other atrix's with other microSD cards.

I do notice that it is faster loading everything than my SanDisk 16GB class 2 card. My camera works faster too: faster to load the pictures and faster to take them.