Collection of uncorrelated entropy during a power down sequence

A data storage device, comprising:

• a non-volatile memory (NVM) arranged to store user data blocks from at least one host device;
• a power management circuit configured to detect a power down event associated with the data storage device;
• an entropy manager circuit configured to collect entropy associated with a state of the data storage device responsive to the power down event and to store the collected entropy in the NVM;
• and
• a controller circuit configured to, responsive to a subsequent reinitialization of the data storage device to transition the data storage device to a normal mode of operation, use the entropy collected and stored by the entropy manager circuit to encrypt data subsequently stored to the NVM.

A solid-state drive (SSD), comprising:

• a non-volatile memory (NVM) comprising a plurality of NAND flash memory dies divided into a plurality of die sets, each die set arranged to store user data blocks associated with a different user;
• a power management circuit configured to detect a power down event associated with the SSD;
• an entropy manager circuit configured to collect and store, in a memory, entropy not correlated to a scheduling of data transfers associated with a first die set;
• and
• a controller circuit configured to, responsive to a subsequent reinitialization of the data storage device to transition the data storage device to a normal mode of operation, use the entropy collected and stored by the entropy manager circuit to encrypt data subsequently stored to a different, second die set.