A mass storage device, a system including the same and an access method of the mass storage device are disclosed. The mass storage device according to the concept includes a flash memory comprising a first group of physical blocks and a second group of physical blocks; and a controller configured to implement a first virtual flash memory translation layer instance and a second virtual flash memory translation layer instance. The first virtual flash memory translation layer instance is configured to receive a memory access request pointing to a logical page number and to generate a memory access request pointing to a physical page number in the first group of physical blocks. The second virtual flash memory translation layer instance is configured to receive a memory access request pointing to a logical page number and to generate a memory access request pointing to a physical page number in the second group of physical blocks.