Ideas for supporting shingled magnetic recording (SMR)

We need what an SSD does internally: it wirtes data into 'erase blocks' and is much data in an erase block is deleted, it is copied compacted into another block, leaving free space at the end.

This is exactly the problem that needs solving for SMR drives. So the methods should be there (cannot be all patented).

There is a light difference: SSDs consist of only erase block, but the block does not need to be written sequentially. While SMR drives are not fully SMR, but have some random access sections. But the SMR parts neet to be written from beginning to end.

Still, there is enough similarity to make me think: solve this on the block layer first.