Although I could not find anything with a web search re whether or not magnets could harm flash drives, I did get this reply to the question from SanDisk: ello Babbete, Thank you for contacting SanDisk Technical Support, and for your recent inquiry into our product line. Yes, magnets and other EMI (Electro Magnetic Interference) devices can affect the functionality of a flash drive. It will not basically harm the flash drive when it touches it or kept beside a magnet for a short period of time, but if it happens constantly and if it is kept beside or on a magnetic device for a long periof of time, it may damage the flash drive. Should you have any further inquiries or concerns, please do not hesitate to reply to this message or send another inquiry via Email. Best regards, SanDisk Technical Support