DiskVerdict icon

DiskVerdict

INSTRUMENT DATASHEET — KNOW WHAT YOUR DRIVE IS GOOD FOR

MODELLU-012
REVISIONv1.0.0
DATE2026-06-16
PRICE0.00 €
LICENSEPolyForm NC
OS: macOS 14.0+ ARCH: Universal ADMIN: none ACCOUNT: none Free · notarized DMG DOWNLOAD ↓

01 Function

Find out what your drive is fast enough for.

Measures read/write performance and rates suitability for editing, development and other workloads.

DiskVerdict grading a volume across eight workflows — each marked well suited with the statistic that decided it

Sustained performance

See when write speeds fall after a drive’s fast cache fills.

History

Compare runs and track performance changes per drive.

Export

Copy a text summary, save an image card or export the measurements as JSON.

02 How it works

STEP 1Pick a volume

Internal, external or network drive. ⌘L

STEP 2Run Quick or Full

Full adds sustained-write and deeper latency tests. ⌘R

STEP 3Read the verdict

See suitability by workload, with supporting measurements.

03 Views

An expanded workflow verdict showing the reasoning, the intensity range it was graded against, and the deciding statistic
FIG. 1 — A verdict and the measurement behind it.
The raw measurements tab — sequential, random IOPS, latency percentiles, and the sustained-write trace
FIG. 2 — Raw measurements and sustained-write performance.

04 Specifications

RequirementsmacOS 14.0 Sonoma or later. Universal (Apple Silicon & Intel). Notarized, distributed outside the App Store.
InputAny mounted volume — internal SSD, external drive, or network share. Enumeration is permission-free (no admin, no Full Disk Access).
MethodReal read/write with the OS cache bypassed (F_NOCACHE). Sequential throughput, 4K random IOPS, per-op latency (avg & p99), and a sustained-write trace.
OutputEight workflow verdicts — each graded well suited / usable / not suited, with the single statistic that decided it.
UpdatesBuilt-in updates via Sparkle.
Accounts / analyticsNone. Everything runs on your Mac — no uploads, no accounts, no analytics.
PriceFree. Optional tip jar.
Your filesTests use a temporary file, removed afterwards. Existing files are not read, moved or modified.

Made by Luces Umbrarum. All apps ↗