root@imx6q-es:~# hdparm -Tt /dev/sda
/dev/sda:
Timing cached reads: 746 MB in 2.00 seconds = 372.83 MB/sec
Timing buffered disk reads: 136 MB in 3.03 seconds = 44.83 MB/sec
root@imx6q-es:~# dd if=/dev/zero of=/tmp/output bs=8k count=10k; rm -f /tmp/output
10240+0 records in
10240+0 records out
83886080 bytes (84 MB) copied, 0.774471 s, 108 MB/s
root@imx6q-es:~# dd if=/dev/zero of=/tmp/output bs=8k count=100k; rm -f /tmp/output
102400+0 records in
102400+0 records out
838860800 bytes (839 MB) copied, 19.1498 s, 43.8 MB/s

ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata1.00: ATA-8: KINGSTON SV300S37A60G, 505ABBF1, max UDMA/133
ata1.00: 117231408 sectors, multi 16: LBA48 NCQ (depth 31/32)
fsl-ehci fsl-ehci.0: irq 75, io base 0x02184000
ata1.00: configured for UDMA/133
scsi 0:0:0:0: Direct-Access ATA KINGSTON SV300S3 505A PQ: 0 ANSI: 5
sd 0:0:0:0: [sda] 117231408 512-byte logical blocks: (60.0 GB/55.8 GiB)
sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA

root@imx6q-es:~# hdparm -Tt /dev/sda
/dev/sda:
Timing cached reads: 752 MB in 2.00 seconds = 376.03 MB/sec
Timing buffered disk reads: 366 MB in 3.00 seconds = 121.82 MB/sec
root@imx6q-es:~# dd if=/dev/zero of=/mnt/output bs=8k count=10k
10240+0 records in
10240+0 records out
83886080 bytes (84 MB) copied, 0.765563 s, 110 MB/s
root@imx6q-es:~# dd if=/dev/zero of=/mnt/output bs=8k count=100k
102400+0 records in
102400+0 records out
838860800 bytes (839 MB) copied, 8.62964 s, 97.2 MB/s