Quote Originally Posted by Ao1 View Post
What takes time is sequential xfers that are constructed from multiple small xfer sizes. We are talking kB not MiB.
Even if they are at 64KB (which is a typical pre-Vista cache manager buffer size), it won't change too much. A typical copy can use async I/O, which would essentially turn the 64KB sequential transfers into a QD>1 "randoms".
Well, on an SSD, there is really no sequential after some point, since the NAND gets rearranged and the LBA sequential mapping is hardly ever physically sequential.
Non async 64KB "sequentials" would therefore be essentially random 64KB at the physical level. Or random 4KB with higher QD at physical level.