Data Retention
As a NAND Flash device ages with use, its capability to retain a programmed value is
affected by the number of PROGRAM and ERASE operations to its cells, causing deterio-
ration. When new, the device has a powered-off data retention capability of several
years, but with use, data retention is reduced.
Temperature also affects how long the device retains its programmed value when power
is removed. High temperature reduces retention capability when power is off, but is not
an issue when power is applied. The SSD drive contains firmware and hardware fea-
tures that can monitor and refresh memory cells when power is applied.
Table 26: Data Retention and Drive Writes Per-Day
Device and Capacity
Typical Data Retention
with Power Removed (Months)
1
Drive Writes per-Day (DWPD)
S655DC
200GB
3
25
400GB
3
25
S650DC
400GB
3
10
800GB
3
10
1600GB
3
10
3200GB
3
10
S630DC
400GB
3
2
480GB
3
3
800GB
3
2
960GB
3
3
1600GB
3
2
1920GB
3
3
3200GB
3
2
3840GB
3
3
S610DC
1920GB
3
<1
3840GB
3
<1
Note: 1. Typical data retention with power removed, at 40 °C and up to 90% of write endurance.
S600DC Series 2.5-Inch SAS NAND Flash SSD
Reliability
CCMTD-1725822587-3891
s600dc_series_2_5_sas_ssd.pdf - Rev. H 9/17 EN
27
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