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| What are the differences between
the SSD Unit and the HDD Unit? |
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| Items |
HDD
Unit |
SSD
Unit |
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| Storage Type *1 |
Magnetic disk |
Flash memory |
| Memory Capacity *1 |
60GB |
16GB |
| Power Consumption *2 |
5.0W (MAX) |
2.5W (MAX) |
| Weight |
Approx. 800g |
Approx. 500g |
| Operation Lifetime |
5 years, or 20,000 operation hours,
whichever comes first |
Guaranteed write cycles: 100,000
cycles *3 |
| Vibration Resistance *1 |
When operating
10Hz to 57Hz:
single-amplitude 0.075mm
57Hz to 150Hz:
9.8m/s²
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Conforms to JIS B 3502,
IEC/EN61131-2
5Hz to 9Hz: single-amplitude
3.5mm
9Hz to 150Hz: constant acceleration
9.8m/s²
X,Y,Z directions: 10 cycles (for 100
minutes) |
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| NOTE |
| *1 |
Because the HDD Unit is based on
a magnetic disk, its memory capacity is big and
it doesn't have limitation on write cycles.
However, having moving parts such as a disk and
a head, the HDD Unit is weak against vibration,
and its deterioration can be a cause of
failure.
The SSD Unit uses a highly reliable
SLC flash memory, but it has limitations on
capacity and write cycles. However, the SSD Unit
is designed to endure extreme shock and
vibration with no moving parts.
The SSD Unit
is superior in access speed to data because it
doesn't make any physical movement of a head and
other parts. Especially, its read performance is
much faster than that of the HDD Unit. |
| *2 |
Because the HDD Unit uses a motor
for disk rotating and head moving, it requires
more power consumption than the SSD Unit; the
SSD Unit consumes 1/3 less power than the HDD
Unit. |
| *3 |
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.
The expected
lifetime when writing 512 MB of data once per
minute is approximately 6 years. For information
on how to calculate the lifetime, see Expected
lifetime based on the number of writes.
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