While many PC makers put hard disk LEDs on the outside of their
computers, Apple hasn't put any disk LEDs on any Macintoshes since the
SE/30. Some Mac old-timers may remember the number of products that
were available during the System 7 era that provided a software disk
LED in the menu bar.

DiskSpy is a small program that acts as a software disk LED for Macs
running Mac OS X. DiskSpy sits in the menu bar and gives visual
notifications when the OS is reading from or writing to a disk.
DiskSpy does not run in the kernel region, does not use any private
frameworks or undocumented APIs, does not require any hacks to use,
does not trap any low-level I/O calls, does not run as the super user,
nor does it actually write to any disk(s) except to save its
preferences, so it is safe to use. And the icons can be customized.

DiskSpy Solid is a more advanced version of DiskSpy. In addition to
giving users a "software disk LED" that shows local disk reads and
writes in the menu bar, DiskSpy Solid also shows network activity in
the menu bar. DiskSpy Solid will show when a read or write is
occurring on any active physical network interface. Some possible uses
include watching reads and writes to network disks (including Apple's
iDisk service, AFP/NFS/Samba/WebDAV disks, and FTP servers), watching
a program use the network, or simply testing to see if a connection is
working.

DiskSpy Solid has several advantages over other programs that have a
similar feature. Many other programs that show network traffic use the
command line utility Netstat, which means they may use more CPU time,
they are dependent on a program that runs with super-user privileges,
they are often fooled by loopback and pipe traffic, and they don't get
information in real time. DiskSpy Solid has none of these problems.

Compatibility
Architecture: PPC x86 (Intel:Mac)

In the spirit of Snow Leopard, DiskSpy & Solid are now built with
64-bit addressing support on both Intel and PowerPC Macs. In addition,
the 64-bit versions use Leopard's garbage collection feature, which
improves responsiveness somewhat.
Both programs require Mac OS X 10.2 or later. Both programs are 4-way
universal binaries.

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