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The method of claim 14 further comprising: recording rebuilding time for rebuilding lost control data by scanning open blocks comparing the rebuilding time with the predetermined time limit and adjusting the frequency according to a difference between the rebuilding time and the predetermined time limit.ġ6. The method of claim 13 wherein the lost control data consists of control data received in an interval between copying operations at the frequency, such that rebuilding the lost control data takes less than a predetermined time limit.ġ5. The method of claim 9 further comprising: subsequent to copying the control data from the volatile memory to the non-volatile memory, losing power and losing control data recorded in the volatile memory recovering copied control data from the non-volatile memory rebuilding lost control data by scanning open blocks and indicating a ready state to a host after rebuilding lost control data.ġ4. The method of claim 11 wherein determining the frequency for copying the control data further includes selecting the frequency according to the relationship between the host write commands and estimated time to rebuild corresponding control data such that estimated maximum time to rebuild corresponding control data copied at the frequency is less than a predetermined time limit selected by a host.ġ3.
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The method of claim 10 wherein determining the frequency for copying the control data includes applying respective weightings to the amount of sequential data and the amount of non-sequential data according to estimated time to rebuild corresponding control data, combining weighted amounts of sequential and non-sequential data to obtain a relationship between the host write commands and estimated time to rebuild corresponding control data.ġ2. The method of claim 9 wherein monitoring host write commands received by the memory system includes determining an amount of sequential data associated with the host write commands and an amount of non-sequential data associated with the host write commands.ġ1. A method, comprising: monitoring host write commands received by a memory system recording control data for data received with the host write commands in a volatile memory determining a frequency for copying the control data from the volatile memory to a non-volatile memory according to the monitoring of the host write commands and copying the control data from the volatile memory to the non-volatile memory at the frequency.ġ0. The apparatus of claim 1 wherein a time limit for the recovery operation is selected by the host and the control circuitry is configured to copy control data from a volatile memory to the plurality of non-volatile memory cells at a frequency determined by estimated time to rebuild the control data such that a maximum estimated time to rebuild the control data is less than the time limit.ĩ. The apparatus of claim 6 wherein the control circuitry is configured to copy control data from a volatile memory to the plurality of non-volatile memory cells at a frequency determined by amounts of sequential data and non-sequential data received with the write commands and a time limit for the recovery operation.Ĩ. The apparatus of claim 1 wherein the control circuitry is further configured to identify sequential data and non-sequential data received with the write commands.ħ.
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The apparatus of claim 1 wherein the temporary data includes one or more of: page or swap file data, browser cache files, and application-created temporary files.Ħ. The apparatus of claim 3 wherein the control circuitry is configured to rebuild control data in a volatile memory by scanning open blocks of the plurality of non-volatile memory cells, omitting the one or more dedicated blocks.ĥ. The apparatus of claim 1 wherein the control circuitry is configured to store the temporary data in one or more dedicated blocks of the plurality of non-volatile memory cells that are dedicated to storage of the temporary data.Ĥ. The apparatus of claim 1 wherein the control circuitry is configured to identify write commands associated with temporary data according to indicators provided with the write commands from the host.ģ. An apparatus, comprising: a plurality of non-volatile memory cells and control circuitry connected to the plurality of non-volatile memory cells, the control circuitry configured to receive write commands from a host, identify write commands associated with temporary data, and omit control data associated with the temporary data from rebuilt control data in a recovery operation in response to an ungraceful shutdown.Ģ.