Application prefetchers improve application launch performance on HDDs through either I/O reordering or I/O interleaving, but there has been no proposal to combine the two techniques. We present a new algorithm to combine both approaches, and demonstrate that it reduces cold start launch time by 50%.

As ransomware inevitably overwrites existing data, SSDs can detect ransomware attacks by monitoring overwrites. The state-of-the-art technology uses a hash to monitor overwrites, which consumes tens of bytes of memory per I/O. To improve memory efficiency, we propose a bitmap-based overwrite detection method that uses only one bit per I/O.