Drive in modular bay recognized as ejectable

I'm not sure if this is appropriate place for this thread, but since the situation occured after Windows 10 install - here goes nothing.

I clean installed Windows 10 on my Fujitsu T734. It has modular bay supporting hot-swap, but in this modular bay I use DIY caddy, and since Fujitsu is very shady about technical details of their equipment I have no idea whether the situation is normal or not.

I was running 8.1 since I bought the machine and there the second SSD always showed up as usual non-removable drive. After clean Windows 10 install with single SSD, I installed Intel RST latest version, installed second SSD in modular bay while the system was off and when I booted the second SSD showed up as removable.

I tried installing chipset drivers and Intel RST drivers from Fujitsu website, then latest versions from Intel website - the situation remains the same. I did install all drivers for this model from Fujitsu website, but skipped the bloatware. When I eject the drive, it behaves exactly the same as USB drive would - becomes unavailable in system. I also tried using an SSHD in the very same caddy, it is also recognized as ejectable drive.

My concern is - are there any drawbacks using SSD like this, mainly will TRIM work on it? Is it the right behavior for modular bay supporting hot-swap? Is it safe to remove this SSD after ejecting the drive in Windows while the machine is running, i.e. is caddy for modular bay supporting hot-swap supposed to be something special, or any caddy will do as long as the bay supports hot-swap?

 

does it recognize the interface as SATA, if so, there should be no problem.

 

@tijo yes, it is recognized as SATA drive, and in CrystalDiskInfo TRIM is mentioned. Another thing I noticed - main battery is recognized as second, and the absent modular battery as primary and described as unavailable. This is all very confusing, to a point I'll try to install 10 on SSHD and check what happens then.

Update:
With SSHD, behavior is absolutely the same. While it is logical that one can eject a hot-swappable SSD in OS before removing the modular bay, the fact that main battery is recognized as secondary is somewhat confusing.

 

I was getting desperate being unable to store "removable" SSD's Bitlocker credentials to TPM, which stalled my work on T734 - but installing very old IRST driver resolved the problem.

 

Had to dump the old IRST driver, because it prevented hardware encryption on my new SSD. So I am stuck with second SSD as removable, because this registry trick doesn't work neither on standard MS AHCI driver nor on latest Intel RST, at least for me. Any ideas?

 

Have you tried the exact same driver you used in W8?

 

@SL2 yes, I used it for some time in Windows 10. It doesn't allow to use hardware encryption of my new drive, thus I had to ditch it.

The current behavior is actually correct because modular bay devices are supposed to be hot-swappable. However, I want to override it, because I currently have no need to how-swap the SSD, and don't want to accidentally safely remove it.

 

If it were a desktop board, the BIOS should have an option to disable/enable hotplug (hotswap or somteimes similar names) and disabling that would make the drive behave as a non ejectable one. Look into your BIOS to see if there is such an option. It is possible that it is set that way in the BIOS and there is nothing you can do about it short of modding it.

 

@tijo such options are absent from T734 BIOS, and there's no modded BIOS available for this machine; Fujitsu did manage to alter this configuration in their old RST drivers, and I hope there is some registry hack to make it recognized as fixed.