Due to the new USB related changes in OSX El Capitan, the Sentry flash drives will need to have it's firmware updated to v4.8.16 or higher.
You can only update the devices on a Windows 7 or higher operating system.
Please download the following file.
Plug in your IronKey drive, but do not open or unlock it, and close any autorun that pops up.
Run the drive update file and follow any OnScreen instructions.
The update should take between 5 and 30 minutes to complete.
Please find the newest updates for Sentry drives here: