SATA III SSD drive running slow

Hi,
I am trying to use a SATA III drive to write data from my Jetson Tk1. I’ve seen the post by JetsonHacks http://www.jetsonhacks.com/2014/08/28/jetson-tk1-ssd-installation/ where he tests a similar drive to the ones I am testing (I’ve tried with two different drives Samsung 850 EVO and Samsung 750 Evo)
In the JetsonHacks test he is able to reach speeds above 200MB/s but my tests only reach around 110MB/s
Any pointers to why there is such difference.
Bellow are the results from my tests.
Thanks.

sudo dmesg | grep SATA
[    4.319494] tegra-sata tegra-sata.0: AHCI 0001.0301 32 slots 2 ports 3 Gbps 0x1 impl TEGRA-SATA mode
[    4.321320] ata1: SATA max UDMA/133 irq 55
[    4.780524] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)

sudo hdparm -Tt /dev/sda1

/dev/sda1:
Timing cached reads: 4470 MB in 2.00 seconds = 2236.93 MB/sec
Timing buffered disk reads: 336 MB in 3.00 seconds = 111.93 MB/sec

sudo dd if=/dev/zero of=/media/ubuntu/SATAJETSON/tempfile bs=1M count=1024 conv=fdatasync,notrunc
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 9.943 s, 108 MB/s

sudo hdparm -iI /dev/sda

/dev/sda:

Model=Samsung SSD 850 EVO 500GB, FwRev=EMT02B6Q, SerialNo=S2RBNX0H945857V
Config={ Fixed }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=0
BuffType=unknown, BuffSize=unknown, MaxMultSect=1, MultSect=1
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=976773168
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6
AdvancedPM=no WriteCache=enabled
Drive conforms to: unknown: ATA/ATAPI-2,3,4,5,6,7

  • signifies the current active mode

ATA device, with non-removable media
Model Number: Samsung SSD 850 EVO 500GB
Serial Number: S2RBNX0H945857V
Firmware Revision: EMT02B6Q
Transport: Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0
Standards:
Used: unknown (minor revision code 0x0039)
Supported: 9 8 7 6 5
Likely used: 9
Configuration:
Logical max current
cylinders 16383 16383
heads 16 16
sectors/track 63 63

CHS current addressable sectors: 16514064
LBA user addressable sectors: 268435455
LBA48 user addressable sectors: 976773168
Logical Sector size: 512 bytes
Physical Sector size: 512 bytes
Logical Sector-0 offset: 0 bytes
device size with M = 10241024: 476940 MBytes
device size with M = 1000
1000: 500107 MBytes (500 GB)
cache/buffer size = unknown
Form Factor: 2.5 inch
Nominal Media Rotation Rate: Solid State Device
Capabilities:
LBA, IORDY(can be disabled)
Queue depth: 32
Standby timer values: spec’d by Standard, no device specific minimum
R/W multiple sector transfer: Max = 1 Current = 1
DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=120ns IORDY flow control=120ns
Commands/features:
Enabled Supported:
* SMART feature set
Security Mode feature set
* Power Management feature set
* Write cache
* Look-ahead
* Host Protected Area feature set
* WRITE_BUFFER command
* READ_BUFFER command
* NOP cmd
* DOWNLOAD_MICROCODE
SET_MAX security extension
* 48-bit Address feature set
* Device Configuration Overlay feature set
* Mandatory FLUSH_CACHE
* FLUSH_CACHE_EXT
* SMART error logging
* SMART self-test
* General Purpose Logging feature set
* WRITE_{DMA|MULTIPLE}_FUA_EXT
* 64-bit World wide name
Write-Read-Verify feature set
* WRITE_UNCORRECTABLE_EXT command
* {READ,WRITE}_DMA_EXT_GPL commands
* Segmented DOWNLOAD_MICROCODE
* Gen1 signaling speed (1.5Gb/s)
* Gen2 signaling speed (3.0Gb/s)
* Gen3 signaling speed (6.0Gb/s)
* Native Command Queueing (NCQ)
* Phy event counters
* READ_LOG_DMA_EXT equivalent to READ_LOG_EXT
* DMA Setup Auto-Activate optimization
Device-initiated interface power management
* Asynchronous notification (eg. media change)
* Software settings preservation
Device Sleep (DEVSLP)
* SMART Command Transport (SCT) feature set
* SCT Write Same (AC2)
* SCT Error Recovery Control (AC3)
* SCT Features Control (AC4)
* SCT Data Tables (AC5)
* reserved 69[4]
* DOWNLOAD MICROCODE DMA command
* SET MAX SETPASSWORD/UNLOCK DMA commands
* WRITE BUFFER DMA command
* READ BUFFER DMA command
* Data Set Management TRIM supported (limit 8 blocks)
Security:
Master password revision code = 65534
supported
not enabled
not locked
not frozen
not expired: security count
supported: enhanced erase
2min for SECURITY ERASE UNIT. 8min for ENHANCED SECURITY ERASE UNIT.
Logical Unit WWN Device Identifier: 5002538d414b5960
NAA : 5
IEEE OUI : 002538
Unique ID : d414b5960
Checksum: correct
Device Sleep:
DEVSLP Exit Timeout (DETO): 50 ms (drive)
Minimum DEVSLP Assertion Time (MDAT): 30 ms (drive)

Solved. It was an issue with a defective SATA cable ( it was bent in more than 90 degrees angles when it arrived), replaced the cable and got over 200Mbs.