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What are the differences between the SSD Unit and the HDD Unit?

Items HDD Unit SSD Unit
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
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)

*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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