Write-once memory device including non-volatile memory for temporary storage

A data storage device comprising:

• a substrate;
• at least one level of solid state one-time programmable memory on the substrate;
• non-volatile memory in the substrate;
• and
• a circuit for writing user data to the write-once memory and using the user data to create error correction data, at least some of the error correction data stored in the non-volatile memory.

Apparatus comprising:

• write-once memory;
• means for buffering an incomplete block of user data;
• means for storing the incomplete block in the write-once memory;
• means for adding padding to the incomplete block to form a padded block;
• means for generating error correction data for the padded block;
• and
• means for storing at least some of the error correction data in the nonvolatile memory.

A method of writing to a device including non-volatile memory and write-once memory, the method comprising:

• buffering an incomplete block of user data;
• storing the incomplete block in the write-once memory;
• adding padding to the incomplete block to form a padded block;
• generating error correction data for the padded block;
• and
• storing at least some of the error correction data in the non-volatile memory.