The Apple ME253 has a Flash storage medium which is faster than the HDD storage medium found on most medium processor core PCs that have been around for more than a year. Flash Drives store information in transistors on a circuit board rather than on optical or magnetic media. This has the advantage of being much faster than a traditional HDD drive. Across all medium processor core PCs that have been on the market for around the same time as the ME253 the worst storage speed is HDD and the best is SSD.
There are a number of alternative Flash personal computers currently available which you might also want to consider including because of it's better review score, the Intel BOXNUC5PGYH0AJ.
If the storage speed of this personal computer is too slow for you then you might want to look at the HP ProDesk 600 G2 Mini (SSD).