Help with super SLOW SSD performance using Inateck enclosure

mjoshi123

macrumors 6502
Original poster
Apr 14, 2010
441
3
I bought USB 3.0 Inateck SSD Enclosure and using it with Samsung 840 512GB SSD. I want to use this as an external scratchpad area to keep files out of my iMac 27 4K 2015. I installed SSD in Inateck, rand DISK UTIL and erased SSD contents and make it ready for use as a blank SSD. When I run Diks Tools Pro or Blackdiamond disk performance tool. The write speed I'm seeing is around 20MB/sec and read speed of around 45MB/Sec. Which is major let down. Because same tools shows me 145MB/Sec of Write and Read for my 8TB Seagate external drives connected to iMac using USB 3.0

What could be wrong here ? I really was looking forward to using this and moving someone my data from iMac to this SSD drive. The Inateck model says FEU3NS-1E for USB 3.0. Help please :(
 

matreya

macrumors 65816
Nov 14, 2009
1,286
127
If it's an 840 EVO then it has a firmware bug that needs to be updated and the update requires the SSD to be connected directly to a SATA port to work.
 
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mjoshi123

macrumors 6502
Original poster
Apr 14, 2010
441
3
If it's an 840 EVO then it has a firmware bug that needs to be updated and the update requires the SSD to be connected directly to a SATA port to work.
Thank you - It is Samsung 840, I bought it 2 years back so maybe something before EVO. Nowhere it says EVO on drive.
 

h9826790

macrumors G5
Apr 3, 2014
14,037
6,645
Hong Kong
AFAIK, that bug is about slow reading performance of old files (>6 months), even exist on OP's SSD, it's nothing to do with this slow benchmark score.

However, lack of TRIM support sure will give a big performance hit on a old SSD, especially running benchmark.

If OP want to test is it TRIM related. You can "secure erase" you SSD, and try again the benchmark. Since your SSD is 512G, I will suggest you only partition 400-450GB, and leave the remaining 50G untouched (right after secure erase). If the performance resume, then it's highly likely TRIM related.
 

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