Peter Rabbitson wrote: > Is the behavior you are describing above [decaying STR] > manufacturer dependent or it is pretty much dictated by the general > design of modern drives? It's an artifact of the physical layout of the disk. Disks are divided into tracks (concentric circles laid out across the surface of the drive). Clearly, the outer tracks are longer than the inner tracks. For a very long time, drives have therefore stored more information on these outer tracks. Since the disk's spindle speed is constant, reading these outer tracks therefore means more data passes under the active read head in a given second. That's why you see sequential transfer rates decay from the start (outer tracks) of the disk to the end (inner tracks). This is the opposite of the behavior seen on CDs, because the start of a CD is the inside track. -Ben - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
