How to choose an external enclosure for an SSD?

Question

Hard disks

I bought a solid state SSD OCZ Trion 150 TRN150-25SAT3-120G, 2.5", SATA III. The declared characteristics say that the read / write speed is around 500Mbps, but when connected to a MacBook via an external box (USB 3.0) Gembird EE2-U3S- 2-S in the BlackMagic Speed ​​Test is a miserable 130 for writes and 220 for reads The drive is initialized with the default MacOS Extended (GUID) Can you tell me what could be wrong I have a feeling that the outer box is failing .

Answer 1

1. A drop in SSD speed from the declared one by 5% is already a reason to think about replacing it.
2. Always test the drive via a direct PC connection to the SATA3 interface to slot 1 with all drives and storage devices (if any) disconnected.
3. Before connecting the case via a USB cable to a PC, make sure that this port has the USB 3.0 standard (as a rule, this is the smallest part of all available ports and they are marked in blue or USB 3.0 marking).
4. When buying, it is better to take a case where support for SATA3 and SSD is clearly indicated, as well as compatibility with the OS on which you plan to work with this case.
For example, this one:

Answer 2

Firstly,
USB 3 provides an interface speed of up to 5 gigabits / s, i.e. up to 625 megabytes / s.
This is the theoretically achievable maximum in laboratory conditions, without taking into account service data.
If you calculate the service data, then it will already be no more than 500 megabits / s.
And the actual speed depends on the equipment used and its compatibility and can be quite different.
, the declared SSD write read characteristics in the region of 500 MB / s mean that in certain circumstances the disk can show such speeds. As a rule, this is a well-established linear reading of a large file.
Actual work speeds depend on the type of load and are usually in the region of 20-300 MB / s

Answer 3

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