Sandisk Technologies Inc.

Western Digital Technologies, Inc.

Disha Gundecha

Raghavendra Gopalakrishnan

Kalpit Bordia

Raviraj Raju

Sagar Uttarwar

A storage device maintains uniform write performance for data written to a memory device including varying block sizes. The storage device includes a balancing module to ensure that free blocks exist in a partition on the memory device and to define a garbage collection threshold based on blocks available in the partition. The storage device also includes a controller to receive host data from a host device, write the host data to the memory device; and relocate the host data in the memory device during a background operation. The controller initiates the background operation on the memory device at the garbage collection threshold and executes the background operation according to a host write-to-relocation write ratio based on a dynamically calculated size of the remaining free blocks in the partition.

Free space management in storage devices having non-uniform-sized memory blocks

Aspects of a storage device for providing superior sustained sequential write (SSW) performance are disclosed. A controller on the storage device allocates buffer space in the host memory buffers (HMBs) on the host device for storage of relocation data, i.e., data to be folded or compacted. The controller or a hardware element therein can therefore allocate local SRAM (including TRAM) for use in accommodating incoming host writes. The increased SRAM allocation of relocation data without an attendant increase in cost or size to the storage device enables the storage device to perform operations in parallel and substantially increase SSW performance metrics.

Allocation of host memory buffer for sustained sequential writes

A storage system has a memory with a multi-level cell (MLC) block that can store multiple bits per cell or can be constrained to store only one bit per cell. Using the MLC block to store only one bit per cell can increase the performance of the storage system but can also reduce endurance of the MLC block. The storage system can monitor a command queue to determine the performance needed. With that information, the storage system can determine whether it is worth making the tradeoff of increasing performance at the cost of endurance.

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Maharashtra, India

Disha Gundecha