Windows 7 Forums

Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: USB3.0 transfer faster than internal SATA III?

29 Apr 2017   #1
teckneeculler

Win7Ultimate
 
 
USB3.0 transfer faster than internal SATA III?

Background:
Just bought myself a new Welland USB3 2xslot hdd dock. It's connected to my 2-year old W7 PC via one of the computer's two USB3 ports (actually, the front one).

My PC's main HDD is a 2-year old 2TB Sata3. It's about half full. (My CPU's an i5, 16GB ram)

Oddity:
I've just copied a bunch of data from my PC to a 2009 Sata2 HDD in the Welland USB3 dock. The transfer rate was between 90-100 MB/s.

Shortly after, I made a copy of a 20GB folder (that is, duplicated it) on my main 2TB Sata3 HDD. The copy transfer rate was about 45MB\s.

I'm surprised, to put it mildly. If anyone had told me that a USB external data transfer could be twice as fast as an internal transfer on the same drive, I would have been skeptical.

Comments anyone?


My System SpecsSystem Spec
.
29 Apr 2017   #2
townsbg

Windows 7 pro 64-bit
 
 

According to Wikipedia the max speed for USB 3 is 5 gbps where as sata 3 the max speed is 6 so they are close.
USB 3.0 - Wikipedia
Serial ATA - Wikipedia
My System SpecsSystem Spec
08 May 2017   #3
essenbe

Windows 7 Enterprise X64/Windows 10 Enterprise X64/Windows 10 Pro X64/Linux Mint
 
 

Internal sata is much faster than USB 3.0. The figures quoted are under ideal lab conditions. You will never see anything close to 6 Gb/s in real life. This may help.
USB3.0 transfer faster than internal SATA III?-esata-usb-3-2.png


My System SpecsSystem Spec
.

08 May 2017   #4
Bat 1

8.1 home x64
 
 

Reading and Writing on the SAME drive will always be significantly slower than transferring from one drive to a second one.
My System SpecsSystem Spec
08 May 2017   #5
essenbe

Windows 7 Enterprise X64/Windows 10 Enterprise X64/Windows 10 Pro X64/Linux Mint
 
 

Quote   Quote: Originally Posted by Bat 1 View Post
Reading and Writing on the SAME drive will always be significantly slower than transferring from one drive to a second one.
I'm not sure I understand what your point is, but there are quite a few threads on this forum about which is faster USB 3.0 or Sata. Sata is always faster. I use both and there are a lot of factors involved that can speed up or slow down copy/transfer speed. But in every case in every thread sata has always been faster.
My System SpecsSystem Spec
08 May 2017   #6
Bat 1

8.1 home x64
 
 

Quote   Quote: Originally Posted by essenbe View Post
I'm not sure I understand what your point is, but there are quite a few threads on this forum about which is faster USB 3.0 or Sata. Sata is always faster. I use both and there are a lot of factors involved that can speed up or slow down copy/transfer speed. But in every case in every thread sata has always been faster.

From The OP:

Quote   Quote: Originally Posted by teckneeculler View Post

Oddity:
I've just copied a bunch of data from my PC to a 2009 Sata2 HDD in the Welland USB3 dock. The transfer rate was between 90-100 MB/s.

Shortly after, I made a copy of a 20GB folder (that is, duplicated it) on my main 2TB Sata3 HDD. The copy transfer rate was about 45MB\s.


Comments anyone?
Shouldn't be hard to understand ?
My System SpecsSystem Spec
08 May 2017   #7
SIW2

Microsoft Community Contributor Award Recipient

Vista x64 / 7 X64
 
 

Quote:
Shortly after, I made a copy of a 20GB folder (that is, duplicated it) on my main 2TB Sata3 HDD. The copy transfer rate was about 45MB\s.
Reading and writing on same disk.
@bat1 is correct.
My System SpecsSystem Spec
08 May 2017   #8
Layback Bear

Windows 7 Pro. 64/SP-1
 
 

My understanding is.

When reading from one drive and writing to another drive is faster because each drive is doing just one thing.
One drive is writing and the other drive is reading.

If one is reading and writing using the same drive that drive is actually doing two things (reading and writing).

Please don't ask me to prove it.

Jack
My System SpecsSystem Spec
08 May 2017   #9
Bat 1

8.1 home x64
 
 

Quote   Quote: Originally Posted by Layback Bear View Post

Please don't ask me to prove it.
Initial Burst was 180MB/s on both tries but speed dropped within seconds.
From SSD C: to SSD D: in My Laptop


From Desktop to Desktop


My System SpecsSystem Spec
Reply

 USB3.0 transfer faster than internal SATA III?




Thread Tools




Similar help and support threads
Thread Forum
Can't transfer old Internal SATA III drive onto a new PC
My old Laptop (Windows 7 Professional 64-bit) 's GPU died. It had a SATA III HDD (WD Blue 750GB Mobile Hard Disk Drive - 5400 RPM SATA 6 Gb/s 9.5 MM 2.5 Inch - WD7500BPVX). Because the GPU died, I couldn't get the files off. (External monitor didn't show anything either). My new PC is an ASUS...
Hardware & Devices
Safety of internal 3.5 Sata IDE in external Sata case for backups
I'm looking at a Sabrent EC-UEIS7 Hard Drive Enclosure - 3.5" IDE/SATA to USB 2.0, eSATA in order to use one of my now internal Sata drives as an 'external' backup device. If I turn the external power off on the back of the external Sata enclosure with my extra old Sata connected in it...will...
Hardware & Devices
SSD 10X faster than SATA?
Have u use SSD? I went to computer store, and i was told that; SSD is 10 X faster on reading and 4 X slower on savings and writing than SATA hard drive.
Performance & Maintenance
SATA drive in USB3.0 Enclosure
Hello - i have a 2.5" Momentus drive (model ST9500420AS, 500GB 16MB cache) and was wondering would get USB3.0 speeds by using an external connector, a USB3.0 cable and my laptop which has built in USB3.0 ports (and the Renesas driver), so i can use it as a portable drive
Hardware & Devices
USB3 install fail: feature transfer error: 2
I tried installing my NEC USB3 3.0 Host Controller File after a repair/upgrade install. Now, I get the above error during the driver setup. I downloaded the driver directly from Asus. Any ideas on the workaround? Thanks
Drivers


Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 08:54.
Twitter Facebook Google+ Seven Forums iOS App Seven Forums Android App