A method of performing a garbage collection operation on a source block includes: performing a plurality of partial page clean operations during a series of host write operations. Each partial clean operation includes: performing a validity check process within a partitioned searching range of the source block to obtain valid page information; and performing a page clean process according to the valid page information and a target clean page number to read valid pages indicated by the valid page information.

Techniques are provided for storing a row address of a defective row of memory cells to a bank of non-volatile storage elements (e.g., fuses or anti-fuses). After a memory device has been packaged, one or more rows of memory cells may become defective. In order to repair (e.g., replace) the rows, a post-package repair (PPR) operation may occur to replace the defective row with a redundant row of the memory array. To replace the defective row with a redundant row, an address of the defective row may be stored (e.g., mapped) to an available bank of non-volatile storage elements that is associated with a redundant row. Based on the bank of non-volatile storage elements the address of the defective row, subsequent access operations may utilize the redundant row and not the defective row.

A computer storage device having a host interface, a controller, non-volatile storage media, and firmware. The firmware instructs the controller to: limit a crypto key to be used in data access requests made in a first namespace allocated on the non-volatile storage media of the computer storage device; store data in the first namespace in an encrypted form that is to be decrypted using the crypto key; free a portion of the non-volatile storage media from the first namespace, the portion storing the data; and make the portion of the non-volatile storage media available in a second namespace without erasing the data stored in the portion of the non-volatile storage media.

Various implementations described herein relate to systems and methods for managing metadata for an atomic write operation, including determining metadata for data, queuing the metadata in an atomic list, in response to determining that atomic commit has occurred, moving the metadata from the atomic list to write lookup lists based on logical information of the data, and determining one of metadata pages of a non-volatile memory for each of the write lookup lists based on the logical information.

In some examples, a system performs data deduplication using a deduplication fingerprint index in a hash data structure comprising a plurality of blocks, wherein a block of the plurality of blocks comprises fingerprints computed based on content of respective data values. The system merges, in a merge operation, updates for the deduplication fingerprint index to the hash data structure stored in a persistent storage. As part of the merge operation, the system mirrors the updates to a cached copy of the hash data structure in a cache memory, and updates, in an indirect block, information regarding locations of blocks in the cached copy of the hash data structure.

According to the embodiments, an external storage device switches to an interface controller for supporting only a read operation of nonvolatile memory when a shift condition for shifting to a read only mode is met. A host device switches to an interface driver for supporting only the read operation of the nonvolatile memory when determining to recognize as read only memory based on information acquired from the external storage device.

A storage management method and a storage management apparatus are provided. In some embodiments, the method includes: detecting, during a preset length of time, a writing amount per time unit of service data of a target network service in a target storage; retrieving a correspondence relationship between the writing amount per time unit and an amount of a redundant storage, wherein the relationship indicates the amount of the redundant storage increases with the increasing of the writing amount per time unit; determining a first amount of the redundant storage corresponding to the first writing amount per time unit according to the correspondence relationship; and configuring the redundant storage for the target network service in accordance with the first amount of the redundant storage.

According to the present disclosure is provided a device and method for mapping management in a flash memory based on partitioning the memory to a main address space and a substitute space, each partition comprising locations in the memory that are denoted by at least three statues according to which locations are mapped from the main space to the substitute space while responsively modifying the statuses.

A data storage device utilized for storing a plurality of data includes a memory and a controller. The memory includes a plurality of blocks, and each of the blocks includes a plurality of physical pages. The controller is coupled to the memory and maps the logical pages to the physical pages of the memory. When the controller detects that a first logical page of the logical pages is a currently-used logical page, it detects whether or not the second logical page which belongs to the last logical page of the first logical page is a currently-used logical page in order to find what is truly the last currently-used logical page.

A memory system includes a controller, a buffer, and a nonvolatile memory including a plurality of blocks, wherein each of the blocks includes a plurality of pages and each of the pages includes a plurality of unit data portions. The controller is configured to carry out garbage collection by reading data from one or more pages of a target block of the garbage collection and selectively copying valid unit data portions included in the read data to another block, count a number of invalid unit data portions included in the read data, and accept, in the buffer, unit data portions from a host as write data, up to a number determined based on the counted number, during the garbage collection.