词条 | Copyback |
释义 |
}} Copyback is a NAND flash memory or SSD operation where data is read from one location in flash memory and written to another location, usually in the same LUN. This data does not need to be sent to the host as the copyback operation does not originate from a read request. Copybacks are closely related to write amplification. Copyback is part of the ONFI specification.[1] Copybacks are done for a variety of reasons:
The copyback operation can either be done by a read and then a write by the controller or as an NAND flash internal copyback operation.[2] However, the internal copyback operation can lead to errors because NAND chips do not have error detection and correction inside them. References1. ^{{cite web|title=Open NAND Flash Interface Specification|url=http://www.onfi.org/-/media/onfi/specs/onfi_3_1_spec.pdf|publisher=ONFI|accessdate=18 September 2014}} 2. ^{{cite web|title=Using COPYBACK Operations to Maintain Data Integrity in NAND Flash Devices|url=http://www.micron.com/-/media/documents/products/technical%20note/nand%20flash/tn2941_idm_copyback.pdf}} 1 : Solid-state computer storage |
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