Not sure if this will help, but this is what I do and I have no problem and I don't use any extra drivers. When I connect the phone to my Mac, I get the error message about the device not being readable. I click ignore then, on the phone, pull down the top drop down menu (whatever that's called) and you'll see a USB icon. Click that and several options come up including to connect as a disk drive. Click that. On my Mac, I then have a device in Finder called NO NAME, which is the SD card.
To disconnect, eject the device in Finder first then change your connection option on the phone to charge only.
Hope this helps.