Abstract: The present application discloses a method and a device for marking dirty bits of an L2P table based on a SSD, the method includes: obtaining a marking request of dirty bits in the L2P table based on the solid state drive; and broadening a corresponding dirty bit in the L2P table to 2 bits according to the request; and setting the dirty bit from a binary number 00 to a binary number 01 through a state machine when a first write command request is obtained; setting the dirty bit from the binary number 01 to a binary number 10 through the state machine when flush operation starts; and setting the dirty bit from the binary number 10 to a binary number 11 through the state machine when a second write command request is obtained during the flush operation.

Abstract: A storage cassette, including: a housing having a substantially hollow interior to receive a biospecimen container via a housing opening; a cover for closing the housing opening; a lock mechanism to be moved between a locked position in which the cover is maintained in a closed position and an unlocked position in which the cover can be moved to an open position; and a latch mechanism which, when the storage cassette is inserted into a rack, prevents inadvertent removal of the storage cassette from the rack. A rack, including a plurality of stacked rack elements, each rack element including an interlocking mechanism for securing adjacent rack elements, wherein each rack element is adapted to receive a storage cassette or each rack element includes a housing having a substantially hollow interior to receive a biospecimen container via a housing opening and a cover for closing the housing opening.