You could have downloaded SequoiaView 1.3 from our software library for free. This free software is a product of Technische Universiteit Eindhoven. The default filenames for the program's installer are Sequoia.exe or VSW2484_B1B7656B.exe etc. The program is included in System Utilities. The most popular versions among the software users are 2.0 and 1.3.
From the developer:
SequoiaView uses a visualization technique called cushion treemaps to provide you with a single picture of the entire contents of your hard drive. You can use it to locate those large files that you haven't accessed in one year, or to quickly locate the largest picture files on your drive.
You may want to check out more software, such as Stellar Phoenix Mailbox Professional, S.M.A.R.T. Disk Monitor or Card Reader, which might be similar to SequoiaView.