Compaq 247320-003 - Deskpro 4000 - 5166 Model 2500/CDS Reference Manual page 27

SMART II hard drives are compliant with the Small Form
Factor Committee Specification for Self-Monitoring, Analysis,
and Reporting Technology (SMART) Version II. SMART is the
industry standard technology, pioneered by Compaq and
originally called IntelliSafe, that allows you to prevent data loss
and minimize downtime, in concert with Compaq Insight
Management Agents.
Ultra ATA Integrity Monitoring monitors the integrity of data as
it is transferred between an Ultra ATA hard drive and the
system's core logic. If the computer detects an abnormal number
of transmission errors, the screen displays a Local Alert message
with recommended actions. An alert is also sent over the
network to the system administrator.
To use this feature on Compaq Deskpro 6000 Series
personal computers, you must replace the standard Ultra
SCSI hard drive with an Ultra ATA hard drive. This
feature is standard on Compaq Deskpro 4000 Series
personal computers.
When the computer encounters an excessive number of error
checking and correcting (ECC) memory errors, the screen
displays a Local Alert message. This message contains detailed
information about the errant memory module, allowing you to
take action before you experience non-correctable memory
errors. Run the Diagnostics Long RAM Test to validate ECC
memory errors. For more information about using Compaq
Diagnostics, refer to chapter 8, "Using Compaq Utilities."
The Prefailure Warranty for ECC memory modules allows you
to replace these modules, free of charge, before the modules
actually fail. ECC memory modules are optional on most
Compaq Deskpro personal computers.
To use this feature on Compaq Deskpro 4000 Series
personal computers, you must replace the standard
DIMMs with ECC DIMMs. This feature is standard on
Compaq Deskpro 6000 Series personal computers.