[fChk]

The storage is HDD if someone wondering whether this 100 GB is SSD or HDD.

How did you come to that conclusion?

There isn't much data in this review nor in your own (https://post4vps.com/Thread-Host4Fun-Rev...y-Host4Fun) to confidently make such a statement.

This assertion in your old VPS1 review thread is false:

It is HDD.

Terminal

lsblk -d -o name,rota
NAME ROTA
sda     1

Why?.. Because the /dev/sda device is a virtual disk and, by the look of it, I would guess it has a virtio_scsi controller, which -together with its friend virtio_blk- will always use the rotational mode, whatever storage device was actually used inside the VPS host.

See this 2009 discussion where the problem first cropped up:
https://bugzilla.redhat.com/show_bug.cgi?id=509383

Second, even if you run that command inside the host and the host is using a HW RAID setup, you'll still get ROTA=1 even if the RAID is based on SSD devices. Because in that case the disk is a construct(/an array) and it uses the RAID controller.

Conclusion:
The best way to know the storage nature is to ask the service provider as it's hard to tell the difference between an SSD-based storage and a HW-RAID-HDD based storage, from a VM stand-point.
[I tried it many times but the results aren't always clear-cut!]

The only thing that can make me lean towards it being an HDD-based storage is its capacity (100 GB), but that's just speculation based on the cost..