Groups of SSDs are also being found in higher-end storage area network arrays for bigger storage needs too. Examples include Texas Memory Systems' RamSan, Solid Data Systems' StorageSpire, and Violin Memory's 1010 appliances which can hold at least a terabyte of data.
What are some of the things to consider in buying an SSD-capable laptop, and are there situations where you would better off with the conventional hard disk-equipped models?
First, let's look at the typical configurations that are currently available. Many manufacturers offer SSDs with (at the bottom end) 32 GB of storage, which can be limiting if you need the space for videos, photographs, or a large email archive. Toshiba sells its laptop with 128 GB SSD, the same price that it earlier offered a model with half that capacity. Dell sells a laptop that starts around $1,500, while the others have configurations that are at least $2,500. Dell also has the widest selection of SSD-capable models: two lines (Latitude and Precision Workstation) and multiple models (at least at this writing) of each.
What about the need for speed? Are the SSDs faster than conventional disks?
For the most part, yes. Dell claims that its SSD can improve Latitude D430 performance up to 23 percent and can reduce boot time by up to 34 percent. Other analysts have seen similar results, because you don't have to wait for the drive to spin up or for the rotors to seek the specific place on the platter to read the data.
Apparent drive speed is made up of several factors: access time, or the time it takes for the disk to locate the data stored on the surface, and transfer rates, or how fast the information can move through the various electronics and bus connectors to the central processing unit of the PC itself.
The speed benefits really are noticeable for the bigger disk arrays, where transaction processing keeps up with nearly continuous storage requests. One user, the electronics cataloger IC Source, replaced their conventional disk drive arrays with the SSD-based RamSan for their database application.
For us that was a major breakthrough in speed, said Peter Moran, President of IC Source. Lets say you update inventory at 8:00 AM. With the old RAID array you would be lucky to have it in the database by 1:00 PM. Now with the RamSan, you can expect to see it online within the hour. In some cases the inventory is updated in just seconds.
But speed isn't the only criterion. What about how much power is used by the SSD, and what it will do to the overall battery life of the laptop?
Before you can make any definitive conclusions, you have to look at more than just the SSD itself. "You need to know what chips and technologies are being used inside the SSD along with what kind of data connection is being used between the SSD and the overall PC itself," says Brian Beard, the Flash Marketing Manager at Samsung.
Beard talks about two factors that can swing SSD-based laptops to either save or consume more power. "First, you have to examine the disk controller used in the laptop," he says. Thinner and older laptops such as the MacBook Air and the older Dell 430 models -- make use of a parallel ATA interface, which uses electronics that can consume more energy and degrade battery life. "The newer laptops use SATA-2 interfaces, which use half the power of the parallel ATA interfaces," he says.