Using a fast Class 10 card, what's the throughput for read and (especially) write?
Yes, I want to know what the achievable speeds are. On some handsets it's more card limited than phone limited. On others it's more phone limited than card limited.
Fair 'nuff. But can I ask why you want to know? 10MB/s is more than enough to stream HD video, and that's about the most demanding thing you can do on an SD card at the moment given that WP8 doesn't let you store apps, app data or anything much else on the card.
Yipcanjo, what brand and capacities are these cards and do you recall how they were formatted?
Thanks
It's more about how fast I can swap data.
Sadly, using an SD card on the Lumia 720 (or the 820, since I've owned both) adversely affects performance of the phone in odd ways. The Music Hub is strangely sluggish, and then usually suffers from showing multiple versions of the same songs -- sometimes 5 or 6 times. The Camera is slow to take your first photo, even when you've set the Camera to store photos in the Phone Storage (not External Storage). Even opening the Settings menu is noticeably slower -- just by having a microSD card installed. Yes, I've tested a couple of Class10 cards, a Class4, and a Class2. Same behavior on all.
Microsoft really needs to fix these issues.
Well, I've purchased a 64 GB Samsung MicroSDXC (Class 10) - last week - which turned up today, so I'll let you guys know how that works out. Only problem is that I STILL have not received my 720 :-( .... But if anyone wants to know anything about the card in advance, just ask.
I FINALLY got the chance to perform the benchmarks you asked for. Ironically, I only had a USB-SDcard reader which performed very poorly. At work I have a L520 thinkpad with an embedded SD Card reader (from Realtek) on a PCI-e bus. Here's the results with the Samsung 64 GB microsdxc:If you can run ATTO or CrystalDiskmark on a PC with a decent card reader it'd be good - that would give is a baseline point of how fast it can accept data.