It's true that some great hosting providers claim to offer 'unlimited' space. The reality is that unlimited space is actually nothing more than a marketing strategy - the provider have applied an large number of other restrictions in place which will prevent you from actually using an very large amount of disk space like file limits(L node limit) etc. We prefer to be up-front and honest about our disk allocations, with no sneaky surprises. Our focus is to provide quality with an affordability, and we tried our best in ensuring that our hosting platform is the best possible in the market. We use highly available SSD block storage - it's significantly faster than traditional SATA based storage, or even standalone SSD drives. We store your data two times for full redundancy, in addition to taking backups.
The truth is, you probably don't need 'unlimited' disk space. Over 85% of sites which we have hosted on our servers use less than 2GB each, so our plans are usually more than adequate for most needs. If your priority is for unlimited space, hosts that offer this usually do so using cheap disks, and often have overcrowded servers. We always want our focus to be on quality, and ensuring that our customers always enjoy the best possible speed and reliability for their websites.