Help with super SLOW SSD performance using Inateck enclosure

[mjoshi123]

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]

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.

 

[mjoshi123]

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.

 

[Fishrrman]

Replace the EVO with a Crucial or a Sandisk SSD, and I predict you'll have much better luck...

 

[h9826790]

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.

 

[Fishrrman]

I don't think that the OP's problems have -anything- to do with TRIM.

 

[h9826790]

I don't think that the OP's problems have -anything- to do with TRIM.

TBH, I also don't think lack of TRIM can bring the SSD down to 20-40MB/s level. But sure will have performance hit, just don't know how much.

 

[mjoshi123]

thanks all for input.