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diglloydTools DiskTester
What diglloydTools DiskTester is
diglloydTools DiskTester is a macOS utility for testing drive performance and reliability on individual volumes or RAID. It offers sequential and random I/O tests, IOPS measurement, file reads, file creation, volume information, and data-integrity checks. The test-reliability command writes to and verifies a whole volume or selected portion. fill-volume fills a volume, reports performance, and can force bad blocks to be mapped out, while recondition is intended to restore SSD performance. run-streams measures throughput across simultaneous read and write streams for video workload assessment. DiskTester can test digital camera cards, network performance, and compare single-drive results over SATA, FireWire, and USB. A graphical interface and Terminal command-line interface are included. It uses temporary test files and opens existing files read-only, operating without special permissions, kernel extensions, or drivers. Results are text output, with supplied spreadsheets able to graph some commands. The product page lists Mojave through Ventura.
Who it suits
It suits Mac users who need volume, RAID, SSD, camera-card, network, or interface performance checks. It can also support video-workload assessment and command-line testing.
What it does well
- Sequential, random, and IOPS testing
- Reliability checks write and verify volumes
- GUI and Terminal command-line interfaces
- Tests video-style simultaneous streams
- Works without kernel extensions or drivers
What to know first
- Paid software with no free plan
- macOS only
- Testing may freeze or hang failing systems
- Results are text rather than built-in graphs
Verdict
DiskTester combines broad storage tests with GUI and command-line access on macOS. It is useful for performance and reliability checks, but intensive testing carries the maker’s warning about unstable systems.
Facts from diglloydTools DiskTester's own pages
- Bad block mapping
- The fill-volume command fills a volume and reports performance, with the side effect of forcing bad blocks to be mapped out. · diglloydtools.com, 8 Oct 2026
- Bad blocks
- The fill-volume command fills a volume to capacity and reports performance, with the side effect of forcing bad blocks to be mapped out. · diglloydtools.com, 9 Oct 2026
- Data safety
- The maker says DiskTester operates at the file-system level as a normal user, does not use special permissions or kernel extensions, and writes only its own test files. · diglloydtools.com, 9 Oct 2026
- File handling
- The maker says DiskTester uses temporary test files and opens existing files read-only; it does not write over existing files. · diglloydtools.com, 8 Oct 2026
- Graphing
- DiskTester outputs text rather than drawing graphs; supplied spreadsheets can graph results for some commands. · diglloydtools.com, 9 Oct 2026
- Headquarters
- 3130 Alpine Rd #288-256, Portola Valley, CA 94028, United States · diglloydtools.com, 28 Sept 2026
- Interfaces
- DiskTester supplies both a graphical interface and a command-line interface, with the latter offering control over test parameters. · diglloydtools.com, 9 Oct 2026
- Internet use
- The purchase page says the installed software works in perpetuity without restrictions and does not phone home or use the internet. · diglloydtools.com, 9 Oct 2026
- License
- The diglloydTools suite is offered under a single-user license for one person on up to two computers; commercial or lab use requires one licensed copy per machine. · diglloydtools.com, 8 Oct 2026
- Limitations
- DiskTester can detect test failures but cannot diagnose or prevent underlying hardware failures, and a failing system may freeze or hang during testing. · diglloydtools.com, 8 Oct 2026
- Maker
- The about page identifies Lloyd Chambers as founder and president of DIGLLOYD INC from 2007 to the present. · diglloyd.com, 8 Oct 2026
- Other tests
- Commands include sequential speed tests, reliability and data integrity tests, file reads, file creation, and volume information. · diglloydtools.com, 8 Oct 2026
- Other uses
- DiskTester can also test digital camera cards and network performance, and compare single-drive performance using SATA, FireWire, and USB. · diglloydtools.com, 9 Oct 2026
- Performance tests
- Its commands test sequential read and write speeds, throughput across multiple simultaneous streams, and performance across a volume. · diglloydtools.com, 9 Oct 2026
- Purchase and license
- The suite is sold under a single-user license for one person on up to two computers, while commercial or lab use requires one licensed copy per machine. · diglloydtools.com, 9 Oct 2026
- Purpose
- DiskTester tests drive performance and reliability for single volumes or RAID. · diglloydtools.com, 9 Oct 2026
- Reliability
- The test-reliability command writes to and verifies an entire volume or a portion of it. · diglloydtools.com, 9 Oct 2026
- Risk limitation
- The maker warns that intensive testing may freeze or crash a flaky system and recommends keeping backups. · diglloydtools.com, 9 Oct 2026
- Security design
- DiskTester operates as a normal user program at the file-system level and does not use special permissions, kernel extensions, or drivers. · diglloydtools.com, 8 Oct 2026
- SSD reconditioning
- The recondition command is described as restoring SSD performance. · diglloydtools.com, 9 Oct 2026
- Support
- The maker directs users to the manual and accepts concise usage questions by email, while workflow advice is offered on a consulting basis. · diglloydtools.com, 9 Oct 2026
- Supported OS
- The product page lists macOS Mojave, Catalina, Big Sur, Monterey, and Ventura. · diglloydtools.com, 9 Oct 2026
- Supported system
- The product page lists macOS Mojave, Catalina, Big Sur, Monterey, and Ventura. · diglloydtools.com, 8 Oct 2026
- Updates
- Download privileges provide access to the current version during the purchased term, and downloaded versions continue to work without further fees. · diglloydtools.com, 9 Oct 2026
Where diglloydTools DiskTester stands on Freedom251
- Disk Benchmark Software#29 of 29