[shikhanshu]

I want to buy a micro sd card for my L640 (W10). But I see different types - class 4, class 10, SDHC, SDXC (maybe others?)

Which one will work best with Win10? in terms of speed and reliability?

Thanks in advance!

[xandros9]

I want to buy a micro sd card for my L640 (W10). But I see different types - class 4, class 10, SDHC, SDXC (maybe others?)

Which one will work best with Win10? in terms of speed and reliability?

Thanks in advance!

It's less the specs and more making sure its a quality card and not a suspicious one from a back alley shop necessarily.

Although as for a baseline, I would get a Class 10 card from a reputable brand. SDHC or XC, I don't have a preference but I believe SDXC is a step up.

[Saijin_Naib]

SDXC is a specification that allows for 32gb+ card sizes, where SDHC taps out at 32gb.

As mentioned, get a real/quality card, go for Class 10 / UHS-1 if possible. I don't think any Windows Phones support UHS-2 (or any Android Phones for that matter), so it'd be a waste of money.

I've had a ton of luck with SiliconPower cards, and NewEgg often has them on sale for some seriously nice deals.

[beachedwhale42]

I've been happy with my G.Skill 32GB SDHC Class 10/UHS-I cards in phones, tablets, and cameras. I trust G.Skill for my PC RAM too.

[RumoredNow]

The bottleneck on most cards is write speed.

I purchased this one and am happy with it: http://www.amazon.com/Samsung-Class-...pUvbUpU3477881

h2testw tested this card on my laptop as follows:
Formatted exFAT
Test finished without errors.
Writing speed: 18.8 MByte/s
Reading speed: 35.3 MByte/s

Very nice write speed. Great for the price, IMHO. Working just fine in my phone (I put this one in my 1520 actually.)

[shikhanshu]

It's less the specs and more making sure its a quality card and not a suspicious one from a back alley shop necessarily.

Although as for a baseline, I would get a Class 10 card from a reputable brand. SDHC or XC, I don't have a preference but I believe SDXC is a step up.

SDXC is a specification that allows for 32gb+ card sizes, where SDHC taps out at 32gb.

As mentioned, get a real/quality card, go for Class 10 / UHS-1 if possible. I don't think any Windows Phones support UHS-2 (or any Android Phones for that matter), so it'd be a waste of money.

I've had a ton of luck with SiliconPower cards, and NewEgg often has them on sale for some seriously nice deals.

I've been happy with my G.Skill 32GB SDHC Class 10/UHS-I cards in phones, tablets, and cameras. I trust G.Skill for my PC RAM too.

The bottleneck on most cards is write speed.

I purchased this one and am happy with it: http://www.amazon.com/Samsung-Class-...pUvbUpU3478000

h2testw tested this card on my laptop as follows:
Formatted exFAT
Test finished without errors.
Writing speed: 18.8 MByte/s
Reading speed: 35.3 MByte/s

Very nice write speed. Great for the price, IMHO. Working just fine in my phone (I put this one in my 1520 actually.)

Thank you everyone for such informative responses. I am most likely going to buy this one.
http://www.amazon.com/Samsung-Class-...pUvbUpU3478000

Looks very positively reviewed, and reliable since its by Samsung and shipped by Amazon. Thank you all!

[beachedwhale42]

Thank you everyone for such informative responses. I am most likely going to buy this one.
http://www.amazon.com/Samsung-Class-...pUvbUpU3478598

Looks very positively reviewed, and reliable since its by Samsung and shipped by Amazon. Thank you all!

Certainly not a bad choice. Personally, I'd pay the extra $4 to go from 16GB to 32GB, especially if you love offline maps.

[shikhanshu]

Certainly not a bad choice. Personally, I'd pay the extra $4 to go from 16GB to 32GB, especially if you love offline maps.

Even 16GB is more than enough for me. I was initially looking for 8GB only.

[avengerxp]

Good choice. I learned this the hard way. I used a cheap class 4 card on my device and my music files were getting corrupt! no apps were installable on SD card etc. then through research I found that you need a class 10 card for it! hapy with my sandisk class 10 on the Lumia 640

[Krystianpants]

I have a cheap one that I've had for years works well on my lumia 950xl. I don't install apps or games on it since no matter what the host controller will be the bottleneck. And older/cheaper phones usually have worse host controllers. But if you only deal with media/documents/etc.. I don't think it matters too much. You MUST format it in the storage section of your phone if you want the best experience. It seems if I ever formatted it using my pc no matter what format it was always wonky, but when I formatted it in the phone it worked great. Mines a generic one and I play high res movies off it fine. Not sure anything has insane bandwidth requirements. Moving files is super slow though.

[rhapdog]

The bottleneck on most cards is write speed.

I purchased this one and am happy with it: Amazon.com: Samsung 32GB EVO Class 10 Micro SDHC Card with Adapter up to 48MB/s (MB-MP32DA/AM): Computers & Accessories

h2testw tested this card on my laptop as follows:
Formatted exFAT
Test finished without errors.
Writing speed: 18.8 MByte/s
Reading speed: 35.3 MByte/s

Very nice write speed. Great for the price, IMHO. Working just fine in my phone (I put this one in my 1520 actually.)

I'll be picking that card up tomorrow. My card died on me after over 2 years of heavy usage. Walmart has these cards in stock for the same price as Amazon.com. Yeah, I've got to pay taxes, but it's cheaper than the shipping and I'll have it tomorrow to boot. I need one fast.

I'm trying to decide between getting 2 of the 32GB at $11.99 or 1 of the 64GB at $22.74. Difference for me would be getting 2 cards gives me an identical backup, just in case, which I can also use in my "backup" phone. Decisions, decisions.

[shikhanshu]

So I ended up buying the Samsung EVO SDHC Class 10 16GB card from Amazon.
It just came in today, I put it in, formatted through the phone and set it as default target for everything except apps (so that apps will reside in internal storage and work faster/reliably)

I moved some pre-downloaded offline maps to the card and the transfer was VERY fast and smooth. Copied over some music and it plays normally in Groove. I am quite happy with the purchase!