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hey i was using 320gb hdd today i install 1tb another hdd. after that 1tb hdd get 180mb/s but 320gb gets 99mb ? why? and isnt both should get 180mb/s? using both sata2 cable

/dev/sdb: Timing cached reads: 7556 MB in 2.00 seconds = 3778.75 MB/sec Timing buffered disk reads: 544 MB in 3.00 seconds = 181.08 MB/sec :~$ sudo hdparm -Tt /dev/sda

/dev/sda: Timing cached reads: 7582 MB in 2.00 seconds = 3791.37 MB/sec Timing buffered disk reads: 300 MB in 3.01 seconds = 99.69 MB/sec :~$ sudo hdparm -Tt /dev/sda

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  • What did the 320GB read before you added the 1TB? Or is that not your question?
    – kmarsh
    Dec 28, 2015 at 18:20

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All else being equal (such as RPM and interface), larger capacity drives usually have higher throughput for one simple reason- more bits pass under the read/write head for each revolution.

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