The SD Card must be formatted in camera after the camera is set to mass storage. The formatting sets the necessary Sony Files and folders. Do not format the SD card in a computer as the camera will not be able to write to it. This applies to all Sony Alpha cameras including F.F, APSC, A-mount and FE-mount. Sony supplies a program that allows Windows, IOS etc to read Sony RAW files.
BTW, this is an old post dating back to August 10, 2009. We haven't had this problem in almost 8 years.
« Last Edit: July 24, 2017, 05:36:22 PM by AScot »
Sony A7, A850, A77, A700 || Sony>> 70-300G, 28-75 f2.8 SAM, 16-80CZ, 50 f1.4, FE 28-70 OSS, FE 24-70CZ f4 OSS, LA-EA4 || Minolta>> 300 f4 G HS, 200 f2.8 G HS, 100 f2.8 (D) Macro, 50 f1.7, 28 f2.8, 28-135 f4-4.5, 70-210 f4, 500 f8 Reflex, TC x 1.4 HS, TC x 2 HS. || Sigma 21-35 f3.5-4.2. || Tamron SP 24-135.