A1 SD Bench v1.1 introduces Cached reads

Today we have released a new version of SD Bench.
We didn’t plan to release this early, however thanks to your feedback we have added a new Speed Test / Benchmark category — Cached reads. Cached reads are reads that fully or partially comes from the RAM cache instead of SD card or phone memory. These results belongs to neither RAM, nor flash memory, so we created a new category.
From Wikipedia:

In computer science, a cache is a component that transparently stores data so that future requests for that data can be served faster.

The keyword here is “Faster”. Now we have 3 separate speed categories:

  1. RAM – the fastest.
  2. Cached reads – middle.
  3. SD cards and other flash storages – the slowest.

Other changes in this version:

  • New: Handling “cached reads”
  • New: Manual submit
  • New: Keep screen on & prevent screen timeout
  • Improved: Result page (nicer & zoom option)
  • Improved: Popular phone model name detection
  • Improved: Longer tests are longer now
  • Improved: About & Settings
  • Fixed: Result screen rotation crash (FC)
  • Fixed: Normalized decimal point usage
  • Fixed: Some misspells


A1 SD Bench screenshots

SD Bench speed test results

A1 SD Bench v1.0.0 available

As of today the A1 SD Bench v1.0.0 is available at Google Play. Use A1 SD Bench – free tool to benchmark your phone & tablet SD cards, RAM and memory, to test IO read / write speed and media performance, and compare your benchmark results online. All devices with Android 2.2 and above are supported.


  • Free, and without Ads
  • Built-in compare results online (anonymous)
  • Speed test any Android storage including RAM and USB
  • Nice looking, clean, fast, responsive & intuitive UI (User Interface)
  • Measure both read and write speeds to find out how fast is your SD card
  • Quick and Accurate benchmark (to reduce caching effects)
  • Check your speed-test results with other devices
  • Speed categories: Class 2 .. Class 10, UHS-I & UHS-II
  • Custom location option to test any device directory

Supported devices:

  • Internal memory
  • Internal SD cards
  • External SD cards
  • System RAM (Random access memory)
  • USB flash drives (including, NAND flash, USB 1.0, USB 2.0, USB 3.0)
  • USB HDD (Hard drives)

Supported memory cards:

  • SD Cards
  • Micro SD
  • Micro SDHC
  • Micro SDXC
  • Phone’s built-in memory (card)
  • Notes: http://a1dev.com/sd-bench/notes/