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Intel SSDSC2CW240A310 520 Series 240GB 6Gb/s SSD — main product image
Intel

Intel SSDSC2CW240A310 520 Series 240GB 6Gb/s SSD

★★★★★5.0 (1 reviews)

Intel's 520 Series delivers 6Gb/s SATA III saturation and hardware AES-128 encryption in a drop-in 2.5" upgrade that eliminates HDD bottlenecks for good.

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Overview

The Intel 520 Series 240GB is a 2.5-inch SATA III solid-state drive built on Intel's synchronous MLC NAND flash and controlled by the SandForce SF-2281 processor. Operating at the full 6Gb/s SATA III bandwidth, it delivers sequential read performance that saturates the interface — meaning the bottleneck shifts entirely to the bus, not the drive. The AES-128 hardware encryption is implemented at the controller level, providing self-encrypting drive (SED) capability without any measurable performance penalty. At 240GB, the capacity is purpose-aligned for operating system and primary application storage rather than bulk data archiving.

This drive was Intel's flagship consumer/prosumer SSD when launched and remains a reliable upgrade path for systems bottlenecked by spinning hard drives. It's well-suited for reviving older laptops and desktops — anywhere a SATA III (or SATA II) port is available and an HDD is the current storage medium. The synchronous NAND differentiates it from budget-tier SSDs of the same era, providing more predictable random I/O at 4K queue depths typical of desktop workloads. Power users migrating a legacy workstation or building a cost-efficient secondary system will find it a dependable performer within the constraints of the SATA interface.

Specifications

Model
520 Series
Capacity
240GB
Interface
6Gb/s

Pros & Cons

👍 Pros

  • Full SATA III 6Gb/s bandwidth utilization brings sequential read speeds that saturate the interface ceiling at ~550MB/s.
  • 2.5" form factor fits directly into laptops, desktops, and servers with a standard SATA bay — no adapter required for most builds.
  • Hardware AES-128 encryption on the controller eliminates CPU overhead for encrypted storage, unlike software-based solutions.
  • Intel's 520 Series uses synchronous NAND for more consistent random I/O compared to contemporary drives using asynchronous flash.
  • Drop-in compatibility with SATA II systems means it works in older hardware, even if bandwidth is reduced.

👎 Cons

  • 240GB capacity is modest by current standards — this drive predates the era of affordable 1TB+ SSDs and is better suited for OS/boot duties than bulk storage.
  • No NVMe or PCIe interface — maximum throughput is hard-capped at ~550MB/s, well below what M.2 NVMe drives deliver today.
  • The SandForce SF-2281 controller used in this series has a known sensitivity to incompressible data (video, already-compressed files), which can cause real-world write speeds to dip compared to sequential benchmarks with synthetic data.
  • No DRAM cache on some 520 Series variants can affect sustained random write consistency under heavy queue depth.

Frequently Asked Questions

Yes. The 520 Series is rated for SATA/600 (6Gb/s), which is the full bandwidth ceiling of SATA III. The interface tops out at roughly 550MB/s sequential read in real-world conditions, and the 520 Series is designed to approach that ceiling — making it effectively interface-limited rather than drive-limited.
Yes, with a performance caveat. SATA III drives are backward compatible with SATA II (3Gb/s) ports. The drive will function normally but will be capped at approximately 275MB/s — roughly half its rated throughput. Still faster than any spinning disk.
The 520 Series uses AES-128 encryption at the hardware level, meaning the drive's controller handles encryption and decryption with zero CPU overhead. If you enable a drive password in your BIOS, all data on the drive is encrypted transparently. Without a password set, encryption is always active but there's no access protection — it's an SED (self-encrypting drive).
Intel rated the 520 Series at up to 70GB of writes per day over a 5-year period for the 240GB model. That's sufficient for typical desktop and workstation use but is not rated for write-intensive server or logging workloads.
No special drivers are needed — it appears as a standard SATA block device to any modern OS. Intel's SSD Toolbox (Windows) can be used for firmware updates and health monitoring, but is not required for operation.

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