| 摘要 |
A system and method for storing infrequently accessed data with reduced power consumption. In one embodiment, a solid state drive (SSD) includes flash memory and environmental data logging circuitry. The SSD is shut off or operated in a sleep mode to reduce power consumption, and turned on or transitioned to an active mode as needed when data on the SSD is to be accessed, or when a calculation, based on a number of erase cycles previously performed in the flash memory and on a temperature history of the SSD indicates that a data refresh may be needed to prevent data corruption in the SSD, due to data retention limitation of the nonvolatile memory in the SSD. |
| 主权项 |
1. A system for operating a solid state drive (SSD) connected to a host, the SSD comprising nonvolatile memory and environmental data logging circuitry (EDLC) and a source of a battery power, the system comprising:
means for requesting, by the host, a length of a first time interval from the SSD; means for providing, by the SSD, the length of the first time interval to the host; means for discontinuing, by the host, during the first time interval, a primary power supplied to the SSD; means for powering of the EDLC, by the SSD, from the source of the battery power during the first time interval; means for logging, by the EDLC, of environmental data; means for restoring, by the host, of the primary power supplied to the SSD; and means for refreshing of data stored in the SSD, by the SSD, when a module evaluated by the SSD indicates that, based on the logged environmental data, refreshing of the data is required. |
