FindDiskKiller is a native macOS disk activity monitor that helps identify which app, file path, or storage device is behind sustained reads and writes. It combines per-process I/O, file tracing, and drive-health evidence while keeping monitoring local on the Mac.
FindDiskKiller is a native macOS utility for identifying what is keeping a disk busy. It brings app-level disk I/O, CPU, network activity, file activity, and drive-health evidence into a single workspace so you can follow sustained reads and writes from the first visible signal to the app, files, and device behind it.
The product distinguishes between process-level I/O, physical device throughput, and file-layer tracing. That separation matters because cache behavior, APFS copy-on-write, snapshots, and other system activity can make disk numbers look different at each layer; FindDiskKiller shows those differences instead of flattening them into one metric.
See per-process disk reads and writes alongside CPU and network sent and received values, with sortable columns and adjustable widths. This makes it easier to compare one app’s activity across multiple resource types at the same time.
Open file locations, inspect recently modified directories, and start on-demand tracing for a specific path to see which process reads or writes it. File tracing ends cleanly when you stop it.
View physical device throughput for mounted volumes using familiar volume names instead of low-level identifiers. The app separates device-level throughput from per-process I/O so the two measurements are not treated as the same thing.
Check drive-health fields such as temperature, lifetime reads and writes, wear level, spare capacity, and power-on hours, when the hardware reports them. Unavailable fields are shown explicitly rather than being treated as zero.
Use a 5-second rate, cumulative totals, peak values, and sustained-pattern views to distinguish short spikes from ongoing activity. The product description says it is built to follow sustained disk activity from signal to source.
Work on the Mac itself with local processing and no data upload. The site states that no process names, file paths, disk serial numbers, monitoring history, ads, telemetry, or third-party tracking SDKs are sent off-device.
Use the app when a Mac feels slow and you want to identify which process is driving persistent reads or writes, rather than chasing short spikes in a general-purpose monitor.
Trace a specific folder or file path when you already know the area of interest and want to see which process is touching it. This is useful for logs, databases, media libraries, or other paths that are repeatedly accessed.
Check mounted external drives when you need to know whether a USB drive or enclosure is actively transferring data. The app shows device throughput and can also surface cases where SMART or NVMe health data is unavailable.
Compare disk, CPU, and network behavior for one app in a single view when you want to understand whether a background sync, download, or upload is contributing to disk pressure.
Review drive-health fields when troubleshooting a storage device and you want temperature, wear, lifetime writes, or power-on-hour evidence that the hardware exposes.
FindDiskKiller combines per-process disk I/O, CPU, network, and file activity with device health data in one macOS workspace. Activity Monitor shows some of the same process metrics, but it does not combine those signals with targeted file tracing and SMART/NVMe evidence.
Yes. It can show throughput for mounted volumes, including external drives. SMART/NVMe health fields depend on the drive, enclosure, and connection type, so some external USB enclosures may not expose those attributes.
Basic monitoring works without admin privileges. When you start file or directory access tracing, macOS may prompt for approval of a background component, and tracing protected locations may require Full Disk Access.
No. The app says monitoring, analysis, and display happen on your Mac, and that process names, file paths, disk serial numbers, and monitoring history are not uploaded.
Quit the app, remove the background component in System Settings > General > Login Items & Extensions, and then drag the app from Applications to Trash. The support page also says no kernel extensions, launch daemons, or launch agents are installed.
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