what is different blk and rev? (.dat) inside block folder
.blk
file store block data.
.rev file contain information needed to handle block reorganization.
Or you could try a file system with compression, such as btrfs using zstd or something. Hopefully that spam bloat is compressible? Should help mitigate a bit the urge for replacing the hard drive.
It's definitely compressible. But don't expect much since,
1. I expect Ordinal user would use compressed file format to reduce TX fees.
2. File system with compression choose fast algorithm.