Physical memory block health based virtual block

A system comprising:

• a plurality of physical blocks, a first subset of said plurality of physical blocks being formed into a virtual block;
• and
• a controller including a memory and at least one processor, said memory including instructions, that, when executed by the at least one processor, cause the at least one processor to:
• collect read errors of the plurality of physical blocks,
• determine respective health grades for the plurality of physical blocks based on the collected read errors, and
• based on the respective health grades, reform the virtual block into a reformed virtual block, said reformed virtual block including a second subset of the plurality of physical blocks.

A computer-implemented method comprising:

• collecting errors of a plurality of physical blocks, a first subset of said plurality of physical blocks being formed into a virtual block;
• determining respective health grades for the plurality of physical blocks based on the collected read errors;
• and
• based on the respective health grades, reforming the virtual block into a reformed virtual block, said reformed virtual block including a second subset of the plurality of physical blocks.