Data protection method and associated storage device

A storage device, for data processing and providing security protection, the storage device comprising:

• a storage unit;
• and
• a controller, arranged to execute following steps:
• (A):
• during an initial period after the storage device is connected to a host, detecting detection the storage device and determining whether the storage device needs to be performed with data protection, wherein the initial period is a period from the storage device being mounted onto the host to the storage device being recognized by the host;
• (B):
• when it is determined in Step(A) that the storage device needs to be performed with data protection, modifying a predetermined writing destination that the host writes data to a storage unit of the storage device in order to make the data from the host be written to another writing destination rather than said writing destination of the storage device;
• or writing the data from the host into a control chip or a bridge chip of an inner memory or an inner register, rather than writing the data from the host into the storage device;
• and
• (C):
• reporting to the host that the writing operation is completed.