MBP late 2011 sd card write extremely slow

I think that this is actually an OS issue. I've found that it is significantly faster to write to SD cards using an external USB drive from a VMware Fusion virtual machine running Linux than it is to do it from the native Mac OS. Clearly something is very wrong for this to be the case.

The reason you havn't gotten any replies is because it would seem no one else uses the SD slot for this type of thing.

Good Luck

Take your MBP to an Apple store genius bar and pose your problem to the resident technicians. They have diagnostic tools at their disposal that may discover some problem. I assume your MBP is still under warranty so there should be no cost to you.

Ciao.

The SD slot on a late model like yours can read/write at 2.5GT/sec (gigatransfers). Don't ask me what that is in Mbps, but much faster than the 480Mbps (60 MB/s) of the older macbook pros. The limit is the card and the file system. Probably formatted at MSDOS-FAT32 by most cameras, windoze will probably like it better.

The card is classed and optimized for camera use - several smallish files around 10MB at a time. testing to near destruction with massive blocks of data will tell you nothing and won't do the card any good. If your camera will take multiple shots of RAW and save them in a couple of seconds in the camera then that's what is important.

Put the SDHC card in, go to About this Mac, system report, then Card Reader and see what the Mac thinks you have. My class 10 shows up as class 4 so somebody is wrong, probably the factory that put the labels on my bargain class 10 card!

I just bought SANDISK EXTREME PRO 16GB. I want to use it as backup of my system (right now I backup my system to 16GB USB but i was hoping to get much faster performance). It reads at 45MB but writes at 9MB which is really dissapointing. When I connect card via USB reader it writes at 15MB. My macbook pro 2011 recognizes the card as CLASS 10.

I wonder if it's hardware thing or there will be OSX update? I have OSX 10.6.8. What do you guys think? I was hoping the new superfast cards could be bridge between regural HD and SSD. You can buy 128GB SD card pretty cheap comparing to SSD not to mention it could be great as portable disk.

I've just tested this card on my older macbook pro 13inch 2010 and the card writes at 14MB and reads at 15MB. The older writes faster than newer but reads much slower. It's a shame that those card readers are so slow.

Push… got the same problem here…

2.5 gt/s card reader, write speed topping at 20 mb/s.