![]() Although each offers advantages and disadvantages (a discussion beyond the scope of this article), NAND has emerged as the favored technology because it delivers faster erase and write times. Flash memory comes in two varieties: NOR and NAND. SSDs are based on flash memory technologies that enable data to be written, read, and erased multiple times. An HDD, however, uses magnetic media to store its data, whereas the SSD uses integrated electronic circuitry to retain specific charge states, which in turn map to the data bit patterns. Like an HDD, an SSD is a nonvolatile storage device that store data whether or not it is connected to power. ![]() You should think of this as an introduction not a complete treatise, a starting point for building a foundation in understanding the inner workings of your SSDs. To help with that process, this article introduces you to several important SSD concepts so you have a clearer picture of the components that go into an SSD and how they work together to provide reliable nonvolatile storage.īear in mind, however, that an SSD is a complex piece of technology and can easily justify much more in-depth coverage than what a single article can offer. The better you understand how SSDs operate, the more effectively you can select, deploy, and manage them in you organization. Concepts such as NAND chips, multi-level cells, and floating gate technologies can be somewhat daunting if you’re still thinking in terms of rotating disks and moving actuator arms, components that have no place in the SSD. They’ve also been dropping in price while supporting greater densities, making them suitable for a wide range of applications.ĭespite their increasing presence in the enterprise, there’s still a fair amount of confusion about how SSDs work and the features that distinguish one drive from another. SSDs are faster, smaller, use less energy, and include no moving parts. Solid-state drive (SSDs) have made significant inroads into enterprise data centers in recent years, supporting workloads once the exclusive domain of hard-disk drive (HDDs).
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