Lexar SL200 1TB Portable SSD Review

By Nathan Kirsch

PCMark 10 Data Drive Benchmark

PCMark 10

PCMark 8 was originally introduced in 2013 and the storage test uses only one thread to do everything. We are by no means living in the single-core era thanks to corporations like AMD offering CPUs with higher core counts than ever before. PCMark 10 Storage uses all the CPU cores available on the platform being tested and has been validated to support up to 5GB/s bandwidth. About half the available cores/threads are being used for generating the data needed for I/O and the other half are tasked with sending out I/Os. The I/O in both PCMark 8 and PCMark 10 is asynchronous. That means that the thread sending an I/O does not sit waiting for it to complete, but can instead queue more I/O to match the queue depth in the recorded trace. The CPU thread count used by the benchmark does not equal to the queue depth seen by the storage device. Most modern software has been written to be a muilthreaded solution where it can push IOs from multiple threads. This should play top the strengths of NVMe devices that have come out in recent years as they were designed to handle multiple queues at the same time. So, the take home message here is that PCMark 10 takes advantage of all available threads and uses newer real-world traces.

PCMark 10 Storage Test

PCMark 10 – Data Drive Benchmark Results:

The Data Drive Benchmark is designed to test drives that are used for storing files rather than applications. You can also use this test with NAS drives, USB sticks, memory cards, and other external storage devices. The Data Drive Benchmark uses 3 traces, running 3 passes with each trace.

  • Trace 1: Copying 339 JPEG files, 2.37 GB in total, in to the target drive (write test)
  • Trace 2: Making a copy of the JPEG files (read-write test)
  • Trace 3: Copying the JPEG files to another drive (read test)

Lexar SL200 Portable SSD PCMark 10 Data Drive Benchmark Score

On the data drive benchmark the results had the Lexar SL200 finishing with an overall score of 580 points. This score again puts the Lexar SL200 near the bottom of the performance chart, which is where it has been for most of the benchmarks.

Lexar SL200 Portable SSD PCMark 10 Data Drive Benchmark Bandwidth

The PCMark 10 Storage Benchmarks overall score is calculated from the bandwidth and average access time sub-scores. The bandwidth subtest is defined by UL in PCMark 10 as bandwidth = bytes / busy_time_for_read_and_write. Here the Lexar SL200 1TB portable SSD averaged 89.6 MB/s.

Lexar SL200 Portable SSD PCMark 10 Data Drive Benchmark Access Time

The final subtest result is the average access time. During a trace playback in PCMark 10, the start and end time is measured for each I/O. So, the average access time is derived from the end time of an I/O subtracted from the start time of that operation. The Lexar SL200 1TB drive had an average access time of 279 microseconds.