Toshiba is the world's leading research and development of the head of the MR and PRML read channel technology, hard drive manufacturers. In 2004, Toshiba introduced the world's first 2.5-inch SATA hard disk. In 2005, the other hard disk manufacturers can not fully support the major system operators and server vendors, SAS system at the same time, Toshiba has launched the world's first SFF SAS hard disk.
Read performance 1. Higher capacities than SSDs.  
Resistance to shock and vibration 2. Better cost performance ( price per gigabyte ) than SSDs  
Moreover, the low power consumption in standby is also one of the features.      
SSD Advantages for the Mobile Computing Market
Compared to hard disk drives, Solid State Drives offer several advantages for the mobile computing market—performance, ruggedness, and lightweight, compact form factors. On the performance side, the advantages of SSDs include faster boot time, faster random read and random write, and faster sequential reads for larger files. This translates to an improved user experience with less waiting time at start-up, loading applications, opening large files, and in general use.
Overall, both MLC and SLC types of SSD have no mechanical parts so they are not prone to mechanical failure, and typically have a higher rated MTTF than HDDs1. This additional ruggedness and reliability is the reason flash-based SSDs have been used since the mid-1990’s in military and mission-critical applications and are now gaining in popularity for mobile computer users.

There is a definite market opportunity for the performance and reliability advantages of SSDs. However, we expect SSDs to coexist with HDDs for the foreseeable future because there is a role for both storage technologies. Toshiba expects the value/performance of its MLC NAND-based SSD line-up to fuel the acceptance of solid state storage among a wide range of applications in the mobile computing market, as well as in other areas that require high density, non-volatile memory.
How will SSDs imapact your mobile strategy?
Listen in as three experts discuss solid state drive technology.
Scott Nelson Brain Kumagai Doung Wong
Enviromental Specification
Temperature Vibration Shock Noise
High Performance SSD
(Op.) 0~70oC (Non-Op.) -40~85oC (Op.) 196 m/s² (20G) (Non-Op.) 196 m/s2 (20G) (Op.) 14,700 m/s² (1500G) (Non-Op.) 14,700 m/s2 (1500G) Non
2.5-type HDD(7200rpm)
(For Latop)
(Op.) 5~55oC (Non-Op.) -40~65oC (Op.) 9.8 m/s²(1G) (Non-Op.) 49 m/s²(5G) (Op.) 3,185 m/s² (325G) (Non-Op.) 8,820 m/s² (900G) 26dB