I have a late 2009 iMac. When I tried to upgrade to El Capitan. He said that the CHIP shows the h/d is a failure and can not be updated. I have install an external withEl of h/d Cap but it is very slow. the h/d is USB 3 but the iMac's USB 2. the h/d is on

I have a late 2009 iMac. When I tried to upgrade to El Capitan. He said that the CHIP shows the h/d is a failure and can not be updated. I have install an external withEl of h/d Cap but it is very slow. the h/d is USB 3 but the iMac's USB 2. the h/d is only 5400 RPM. a 7200 RPM 7 / would accelerate the iMac?

No, because the limiting factor is the computer is USB 2.0, which is how it connects any external drive apart the external drive. As USB 2.0 is much slower, there is no real advantage to a 7200 RPM drive. What you need is a Firewire enclosure that supports FW800 which is much faster than USB 2.0.

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