Вот выдержка из спецификации на SD от Тошибы.
5.Physical Characteristics
5.1.Environmental Characteristics
1) Standard Operation Conditions
Absolute Maximum Temperature Range: Ta = -25 to +85 degrees centigrade
(Humidity less than RH = 95 %, Non condensed)
Recommended Operating Conditions: Ta = 0 to +55 degrees centigrade
(Humidity RH = 20% to 85 % Non condensed)
Note:
Absolute maximum temperature range shows the maximum range which can operate in some condition,
and DOES NOT mean a guaranteed operation in any conditions.
For the Stable operations, the recommended operating conditions are suggested...

Т.е. устойчивая работа гарантируется при темп. от 0 до +55С