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Lets take common numbers:

SATA HDD - 120Mb/s read, write speed heavily depends on gaps in sequence
SATA SSD - 550Mb/s read, 500Mb/s write
PCIe SSD - 2500Mb/s read, 1500Mb/s write

Lets assume they are connected to AHCI controller (not RAID controller). If we connect two identical drives to AHCI (not RAID-0) and use two-threaded application running on two CPU cores to read/write sequental data, will be speed doubled?

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  • theoretically yes, practical anything from actually beeing slower to nearly close to 2x the speed is possible.
    – Dennis Nolte
    Oct 23, 2015 at 7:45
  • Very likely true, if your application is well written for that situation.
    – Ryan Babchishin
    Oct 23, 2015 at 7:47

1 Answer 1

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will be speed doubled?

Yes, No, Maybe - anywhere in between - it entirely depends on the actual configuration and the nature of the use case. In real terms yes you should see some benefit but the only way to know is to test it as you need.

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