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Oleg
Premium
join:2003-12-08
Birmingham, AL
kudos:2

External HDD eSATA vs. Internal SATA speed

I just have done benchmark speed test, and my External HDD is about 7MB/s slower than my Internal HDD. Does it depends on the enclosure and bottleneck?
I know it is not a big deal, but i still would like to know what could be the case.

JoelC707
Premium
join:2002-07-09
Lanett, AL
kudos:5
In a general sense, eSATA = internal SATA in pretty much every respect. There may be a difference in PHY speeds (SATA600 internal and eSATA300 external) but even then that in itself won't usually show any difference with a MHDD. Honestly, your 7MB/s difference is likely within acceptable margin of error in the test.


Oleg
Premium
join:2003-12-08
Birmingham, AL
kudos:2
Here are the results:

CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
Crystal Dew World : »crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 116.824 MB/s
Sequential Write : 100.007 MB/s
Random Read 512KB : 53.236 MB/s
Random Write 512KB : 50.396 MB/s
Random Read 4KB (QD=1) : 0.818 MB/s [ 199.8 IOPS]
Random Write 4KB (QD=1) : 1.221 MB/s [ 298.0 IOPS]
Random Read 4KB (QD=32) : 0.854 MB/s [ 208.5 IOPS]
Random Write 4KB (QD=32) : 1.279 MB/s [ 312.1 IOPS]

Test : 100 MB [E: 36.5% (339.7/931.5 GB)] (x5)
Date : 2012/10/06 22:49:16
OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x64)

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
Crystal Dew World : »crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 123.489 MB/s
Sequential Write : 117.441 MB/s
Random Read 512KB : 46.920 MB/s
Random Write 512KB : 68.754 MB/s
Random Read 4KB (QD=1) : 0.611 MB/s [ 149.2 IOPS]
Random Write 4KB (QD=1) : 0.554 MB/s [ 135.2 IOPS]
Random Read 4KB (QD=32) : 0.759 MB/s [ 185.2 IOPS]
Random Write 4KB (QD=32) : 0.491 MB/s [ 119.9 IOPS]

Test : 100 MB [C: 8.1% (37.8/465.7 GB)] (x5)
Date : 2012/10/06 22:57:57
OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x64)


koitsu
Premium,MVM
join:2002-07-16
Mountain View, CA
kudos:23
What JoelC707 See Profile said is 100% correct.

That said: your on-board SATA controller is different than the controller which drives the eSATA port, isn't it? Provide the exact motherboard model.


Jan Janowski
Premium
join:2000-06-18
Skokie, IL
Reviews:
·Comcast
reply to Oleg
On laptop we have internal SATA disks, and an external Esata drive (Via Express Slot) configureable as 2 drives or a raid0.
Using same drives in both locations (Momentus XT-500Gb)
With Esata set for JBOD, I saw no speed differences between internal SATA and external Esata drives...
Only when I configured external drives as Raid0 did I see a speed increase....

My $.02
--
Looking for 1939 Indian Motocycle


Oleg
Premium
join:2003-12-08
Birmingham, AL
kudos:2

1 edit
reply to koitsu
Forgot to mention i have an eSATA bracket installed. As far as motherboard goes i have Gigabyte GA-M68MT-D3 »ee.gigabyte.com/products/page/mb···t-d3_23/


koitsu
Premium,MVM
join:2002-07-16
Mountain View, CA
kudos:23
Ugh, you really shouldn't use those.

I would recommend you run 10 benchmarks for each type (native SATA vs. eSATA bracket) and then average out the results. If the numbers are consistently different/lower, then I don't have an explanation. Else it's completely possible Windows was doing some form of I/O to/from the drive in the middle of the benchmark -- this happens all the time.


Oleg
Premium
join:2003-12-08
Birmingham, AL
kudos:2

1 edit
You are right. I just have retested again and the results are different. So as i understand it is better to get PCI eSATA controller card. I have checked out Newegg, and i can get one for $13 shipped ( Free shipping with shop runner membership) »www.newegg.com/Product/Product.a···823&SID=


koitsu
Premium,MVM
join:2002-07-16
Mountain View, CA
kudos:23
See here for a list of eSATA HBAs I can recommend (non-buggy chipsets):

»Re: Motherboard layout for HP DL360 G6....

You should not be looking at PCI controllers because the 32-bit PCI bus is limited to 133MBytes/second. You should be looking at PCIe.
--
Making life hard for others since 1977.
I speak for myself and not my employer/affiliates of my employer.


Oleg
Premium
join:2003-12-08
Birmingham, AL
kudos:2
Thanks koilsu for the correction. I will definitely order one soon.