Hi auzzie1077!! Welcome to the forums!! If you are on a budget go for the cheaper one, as for the size, bigger is better!!

Also look at this thread.
http://androidforums.com/samsung-galaxy-s4/734242-sd-card-size.html

 

SDHC was the standard for cards up to 32GB. SDXC is essentially the same only for larger ie 64GB cards. I suspect you would almost instantly regret buying an 8GB card as you won't fit much on that but I don't know your needs.

Brand shouldn't make much difference but don't buy a suspiciously cheap one from eBay as it will be a fake (ie it will report that it is 16GB but will actually be 2GB so any data over 2GB you put on it will silently be lost). SanDisk used to have a good reputation but they have produced some duff 32GB and 64GB cards recently. You should be safe with Samsung.

Having said that, any card you buy from a reputable seller such as Amazon should probably be fine. You should probably go for one of the faster cards such as a class 10 card. If you are only buying a small card, it will still be fairly cheap.

 

A lot of people are happy with this one. Different sizes are available.

Amazon.com: SanDisk Ultra 64 GB MicroSDXC Class 10 UHS-1 Memory Card with Adapter (SDSDQU-064G-AFFP-A): Electronics

 

Any benefits to stepping up to this?

Amazon.com: SanDisk Extreme 64GB Class 10 microSDXC UHS-I Memory Card: Computers & Accessories

 

Why do SD cards have classes? What is their significance?

 

Speed and Quality

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Speed of reading and writing. Some are made for more harsh environments.

 

So they will be qualified for better jobs and be able to earn more.

 

Keeping in mind that you can now install apps to the SD card along with the need for faster write speeds for recording 1080p video and burst shots, it would be best to go with the fastest class of card you can afford. Class 10 is ideal but definitely no slower than class 6. The faster the card, the quicker all of these functions will operate.

 

Speed only. It doesn't tell you anything about the quality or toughness of the card. This article on Wikipedia explains the detail Secure Digital - Wikipedia, the free encyclopedia.

 

i just bought a 32gb no need for 64 gb

 

I'd be careful about getting a Class 10 32GB, Samsung phone's seem to have a habit of killing 32GB Class 10 cards no matter the brand. Maybe a 64GB MicroSDXC will be better otherwise a 32GB Class 6 is what I'd get.

My GS4 just tore through my 2nd SanDisk Ultra U1 Class10 32GB, my GS3 ruined the 1st one, it's a huge issue.

 

my vote goes to Scandisk class 10....32g

 

Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10! Class 10!

Did I mention that I recommend getting a Class 10 card?

 

It could just be that your phone has issues or you bought one of the many FAKE SanDisk cards. Always buy SanDisk cards from reputable dealers. What makes you say Samsung phones vs your Samsung phone? You are the very first person I've heard of any phone having an issue just because of the Class of a memory card. I've used Class 10 cards in every device that I own that accepts an SD or MicroSD card and never had a card failure. I've had a SanDisk 32GB Utra in my Samsung Galaxy S4 from the day I bought it. I'd do a little research on exactly what the "class of cards mean".

Also many people are saying buy the fastest speed out there. The device you are using the card in determines just how much of that speed you can use. If a device can only transfer to or from the card at a particular speed, as is the case with all devices, then it does no good to buy a card faster than your device, just for the sake of buying a fast card. I'm a long time photographer and many people use to say the same about the memory cards you buy for your camera. You can now look up how fast your camera transfers, and base your card speed on that. Now with that having been said, I buy Class 10 cards, as the cost difference is not that much.

 

I'm having issues with this one:

Amazon.com : SanDisk Ultra 64 GB microSDXC Class 10 UHS-1 Memory Card 30MB/s with Adapter SDSDQUA-064G-U46A : Electronics

Files disappear, the entire card disappeared once, etc. It's going back.

Edit: Before removing it I reformatted it, and it came back as 0 GB.

 

I'm looking for an SSD card too. Does anyone know what the Mb/s on the S4 is? Any specs with how fast this thing can go?

 

Hilarious. Thanks for the laugh.

 

There is a quite exhaustive thread on the S3 forum, currently third page I believe, about SD cards being disabled by that phone. Different brands and speeds. His statement is not the first I've heard of that and in fact, I just got rid of my S3 and moved up to the S4 and was having some issues with the card in my S3 as well. Having said that, I don't think it was the card, but they phone having issues. Although, in reading through that thread, there were some statements regarding replacement cards from SanDisk I believe that were acknowledged as being in a bad batch of cards, specifically certain size and speed, if I'm not mistaken. My card is a Samsung 16 gig card that came with my old memorize. Lol. It is now housed in its 4th phone and luckily no longer in the S3 where I was becoming afraid it my die.

 

Note I said "because of the Class" of the card...meaning typically there was either a problem with the phone or the card being defective.

 

Your statement was noted. I was simply directing your attention to some interesting statements regarding the class AND size of some (actually more than some) cards that are being fried. No harm no foul.

 

Whatever you do is stay away from SanDisk 64GB cards, i spent 60 bucks on one and everytime i go into my s4's picture gallery i always get a "sd card has been unexpectedly removed" message.

Very annoying, what a waste of 60 dollars.

 

I'm not sure how long you've had it, but part of the reason I buy from Amazon is returns are a breeze. I seldom hassle with returns other places.

Also, I think at Costco you still have a year to return on electronic devices.

 

Thus far, I've had great luck with my 16 GB Samsung card.