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sudo hdparm -Tt /dev/sda

/dev/sda:
 Timing cached reads:   
28146 MB in  1.99 seconds = 14155.11 MB/sec
 Timing buffered disk reads: 518 MB in  3.00 seconds = 172.41 MB/sec
 
$ sudo hdparm -Tt /dev/sdb

/dev/sdb:
 Timing cached reads:   29020 MB in  1.99 seconds = 14598.06 MB/sec
 Timing buffered disk reads: 1254 MB in  3.00 seconds = 417.52 MB/sec

$ sudo hdparm -Tt /dev/sdc

/dev/sdc:
 Timing cached reads:   27324 MB in  1.99 seconds = 13739.95 MB/sec
 Timing buffered disk reads: 374 MB in  3.01 seconds = 124.15 MB/sec

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/dev/sdb1:
 Timing cached reads:   18018 MB in  2.00 seconds = 9020.04 MB/sec
 Timing buffered disk reads: 2942 MB in  3.03 seconds = 970.73 MB/sec

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 Timing cached reads:   17874 MB in  2.00 seconds = 8947.98 MB/sec
 Timing buffered disk reads: 2686 MB in  3.01 seconds = 892.44 MB/sec