Why is the memory card not being showed?

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http://superuser.com – I have a brother who has a 1GB memory card that is 4years old inserted in his memory card. Now one day he was drowsy and in that condition, he added a password to the memory card. Later he slept and when woke up he had forgotten the memory card's password that he had given. Now if he inserts the memory card to laptop via a memory card reader, no device is detected. In fact no computer is abble to detect it. Only in his mobile phone it is being shown. So my question is has this problem i.e. unbale in detection of the memory card, arisen due to passwrod locking? And as he totally forgot the pass (HowTos)