This is Steve Brecher's DiskTimer 1.1, updated to compile with MPW 3.0
(and with the resource file re-created from scratch) by Steve
Crutchfield in 2021, since the original resource file and binaries
appear to be lost to time. Source code by Steve Brecher with my very
tiny tweaks included.

DiskTimer 1.1 is designed to compare hard disk access times, but the
"read" and "write" metrics work for floppies, too. DiskTimer reports
the time to read and/or write 32KB blocks to/from the startup disk 100
times each, and also provides a seek-time metric. The metrics are
reported in seconds (accurate to 1/60 second) and techniques are used
to ensure the results are unbiased.

Version 1.1.1 adds a description of the metrics, and modern tweaks to
show a progress indicator and provide the ability to cancel by holding
the mouse button.

The screenshot was run on Mini vMac on a modern machine which is why
the times show up as 0.00 seconds (the modern emulator is too fast to
be measured!). You will get real times on a vintage Mac (it may take
several minutes). By the way, the point of this utility is to be tiny
-- it should run on any old Mac including a 128k, and with any system
version.
MPW C source code is included.

Compatibility
Architecture: 68k

This should run on any version of the classic Mac OS. It has only
modest memory requirements and uses only the most basic Toolbox calls.