Sony PCG-GRT170 - Manual (Page 177)

How do I extend the life of the Memory Stick media?
 Use the supplied storage case. See the instructions that came with your media for more information on its use.
 Do not use or store the media in a location that is subject to:
 Extremely high temperatures, such as in a car parked in the sun
 Direct sunlight
 High humidity or places with corrosive substances
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