PS-3710A/PS-3711A Series Hardware Manual
2-4
• When using any of the PS-A’s optional devices, be sure to check that device’s
specifications for any special conditions or cautions that may apply to its use.
• Be aware that not only does the Hard Disk/SSD have a fixed lifetime, but that
accidents can always occur. Therefore, be sure to back up your Hard Disk/SSD’s
data regularly, or prepare another Hard Disk unit that can be used for backup.
• The Hard Disk lifetime given here may be reduced due to unforeseen
environmental factors, however, generally speaking, the disk should last for
20,000 hours (of operation) or approximately 5 years, whichever comes first at an
operating temperature of 20°C and 333 hours of operation per month. (HDD
access frequency of 20% or less)
• Using the Hard Disk in an environment that is excessively hot and/or humid will
shorten the disk’s usage lifetime. A wet bulb temperature of 29°C or less is
recommended. This is equivalent to the following data.
• In order to extend the lifetime of the hard disk, Pro-face recommends you set the
Windows
®
2000's [Control panel]-[Power Options]-[Turn off hard disks] selection
or the Windows
®
XP’s [Control panel]-[Performance and Maintenance]-[Power
Management option]-[Turn off hard disks] selection to turn the hard disk off when
the unit is not being operated. A setting of 5 minutes is recommended.
• The SSD unit has a limited number of writes. Exceeding the guaranteed number
of writes could make it impossible to read and write data, or systems may
become unstable resulting in malfunctions.
• You can calculate the expected lifetime of the SSD unit based on the number of
writes.
SSD memory capacity
*1
: 15,631 MB
Guaranteed number of writes
: 1 hundred thousand
The expected lifetime when writing 512 MB of data once per minute is
approximately 6years.
Depending on the system and software, data writes may actually be run several
times even when only one write command is made. This can lead to actual
lifetimes significantly different from expected lifetimes.
In order to make more accurate lifetime predictions, please use Pro-face's
System Monitor, which is included with the PS-A unit.
*1
The SSD unit incorporates the Static Wear Leveling function.
When calculating the expected lifetime, do not omit areas used by OS.
Temperature
Humidity
at 35°C
no higher than 64% RH
at 40°C
no higher than 44% RH
