The LifeBook S904 has a better storage medium than most laptops of a comparable type and age to it. This notebook PC has an SSD storage medium, whereas most medium processor core notebook PCs that have been around for around the same time as it have an HDD storage medium. Solid State Drives (SSD) store data in semiconductors on a circuit board rather than using magnetic or optical media. Solid State Drives have no moving parts which makes them very fast and reliable.
An SSD storage medium is in fact the best storage medium across all medium processor core notebook PCs that have been on the market for a comparable time to the LifeBook S904.
Across similar types of laptop the worst storage medium is HDD.
If the storage medium of this notebook PC is not good enough for you then you might also want to look at the T420s[pl_48433_price] (SSD), or the S540[pl_2433540_price] (SSD) both from Lenovo.