USB SSD being id as HDD

As stated, this a Crucial issue. The USB Controller inside the enclosure was supposed to be used with a standard HDD but they used it on an SSD and it Identifies as a HDD.
The device has to be sent back to Crucial to be replaced with the proper USB Controller, unless Crucial has a Firmware Update for their enclosure, which they probably won't have and may even deny you a replacement, but you have to try with them, you have done everything you can do on your own.

Thanks for help. They are still blaming 4 different computers and as you say saying they will not exchange it as it works as windows ignores the HDD. This is after being told and sent screen clips of it defragging, repeatedly being told of the same HDD issue on 4 PC's and a second X9 not having the same problem (even saying a replacement would do the same as the faulty one!). I am not impressed by Crucial over this. I also have had to send back a X10n for refund as it kept being rejected as unknown on the laptop after over heating when copying the data (1.5 TB) from the X9 (cut speed down to 1-2Mb for last 25%, a replacement SanDisk one had no problems). This will be the last time after using them for years I will get there products. Thanks for help again

John7 said:

Given it’s the same on both PC’s and other USB SSDs are OK would I be right in thinking it’s the mor=st likely problem?

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IMO it's either the drive itself or the enclosure it's in. Crucial has a 3-5 year guarantee depending on the model.
R&R it. DEMAND it be replaced and throw a bucking hissy fit if they refuse, If 1st level support refuses, DEMAND to speak to a supervisor. I've used Crucial ram for years and they've always been good to work with me. It's been a while so like so many companies these days, getting service may be like pulling teeth.