| 摘要 |
<p>Shingle written magnetic recording (SMR) disc drives with hybrid E-regions include a non-volatile solid state memory E-region 19 in addition to a magnetic media E-regions 16 on disk 12. System electronics 21 restages a set of exception records from the disc E-region to the memory E-region in an order as read from the disc and then writes the set of exception records back to the disc E-region in a different order. This reduces the time and energy spent in executing seeks in the disk E region. The ratio of the size of the solid state memory E-region to the total E region capacity on the disks can be optimized for selected applications according to the invention using tradeoffs between performance and cost. For example, a memory E-region size that is 10% of the total disk E-region capacity achieves substantial performance enhancement over a disk-only E-region implementation and also results in smaller costs than would be required in a NAND-only memory E-region.</p> |
