Diskio vs REC Disk Speed Test

How fast is your storage? Measure sequential read and write speeds on your iPhone or a compatible external drive. Go beyond one number with repeat runs and a detailed report. SEE THE WHOLE RESULT Choose 1, 3 or 6 runs. With 3 or 6 runs, see median read and write speeds, minimum and maximum values, and the result of every run. CHECK CONSISTENCY Choose 6 runs to assess read and write stability separately over the last five. See whether results are stable or vary, with the criteria explained in the app. TEST YOUR SETUP Use your iPhone's internal storage or select a compatible, writable external drive through Files. Choose a test file from 1 to 5 GiB and a block size of 1, 2, 4, 8 or 16 MiB. The defaults are 6 runs, a 1 GiB file and a 2 MiB block. UNDERSTAND THE MEASUREMENT Speeds are shown in MB/s, and write timing includes final filesystem synchronization. Follow each write and read phase as the test runs. SHARE THE DETAILS Send a result card with the full report, test settings and, after 6 runs, the stability assessment. The interface supports light and dark appearances, larger text and Reduce Motion. ADAPTS TO YOUR DISPLAY On iPhone Duo, an expanded layout gives controls and results their own space. Your report stays available as the layout changes, and narrow windows use a compact view. GET STARTED 1. Select your storage and test settings. 2. Start the test and keep Diskio open. 3. Review the report or share your results. A test needs enough free space for a temporary file. External storage must be accessible and writable through Files. Results depend on the device, storage, connection, free space and test settings. The stability assessment adapts numerical criteria from SNIA SSS PTS. It is not a full SNIA-compliant benchmark, a drive-health check or a sustained-performance rating. Results from version 3.0 onward may differ from older versions because the measurement method was revised.

Never lose a shot to a slow drive. Recording ProRes to an external SSD is one of the best things you can do with your iPhone Pro, until the drive can't keep up and your footage stutters, drops frames or stops recording. REC Disk Speed Test tells you whether your drive is up to the job before you hit record. Plug in your USB-C drive, tap Start, and get a clear answer in seconds. WHAT YOU GET • Real write speed: See exactly how fast your drive writes, in MB/s, measured on your own iPhone. • A clear verdict: Color-coded results tell you at a glance whether your drive is ready for everything, most things, or only lighter formats. • Format-by-format breakdown: Check marks for HEVC 4K60, HEVC HDR, and ProRes 10-bit HDR at 1080p30, 4K30 and the demanding 4K60. • File system check: Find out right away whether your drive's format is supported for video capture, so you don't discover a problem on set. • Drive details: Name, capacity and free space, all on one screen. PERFECT FOR • Filmmakers and content creators shooting ProRes on iPhone • Testing a new SSD before a shoot, or before you buy more • Comparing drives, cables and enclosures to find the fastest setup • Peace of mind before an important recording Free, simple, and built by the team behind REC and Photon Camera. FROM LATENITESOFT Pair your tested drive with REC to record cinematic video in any format straight to external storage, or with Photon Camera to shoot stunning photos directly to your drive. Requires iPhone 15 Pro or a later Pro model with USB-C external storage support.