47
SSD Selection Guide
Appendix
IND100077-130
Calculation of required size of SSD (Multi-Level Cell - MLC) device)
The table below details the write endurance of the an enterprise environment. All values are verified by Hatteland
Display during the qualification / selection process.
Write Endurance Specifications
Previous
2.5” SSD (MLC)
Write Endurance Specifications
Current
2.5” SSD (MLC)
Device Size
Value in TBW (Terabytes)
Device Size
Value in TBW (Terabytes)
80 GB
45
150 GB
412
120 GB
70
240 GB
599
160 GB
100
480 GB
945
240 GB
140
800 GB
1663
300 GB
225
960 GB
1750
600 GB
330
1200 GB
2455
JESD218 standard1 and based on JESD219 workload.
Formula for calculating disk size:
z
=
y
*
x
Where
y
= Requested minimum lifetime (with respect to wear out, [year]).
Where
x
= Data rate (GB /per year).
Where
z
= Total amount of data written data to SSD during its whole lifetime.
Step-by-Step Calculation
Step 1: Measure (preferred) or estimate data rate
y
, [GB /per year].
Step 2: Define minimum expected lifetime for SSD device
x
[year].
Step 3: Calculate total amount of data written to the SSD during its whole lifetime,
z
=
y
*
x
.
Step 4: Use table,
column 2
, the
z
value shall be less or equal to the value in the table to achieve requested lifetime.
Write Endurance Specifications
Previous
2.5” SSD (MLC)
Write Endurance Specifications
Current
2.5” SSD (MLC)
Device Size
Value in TBW (Terabytes)
Device Size
Value in TBW (Terabytes)
80 GB
45
150 GB
412
120 GB
70
240 GB
599
160 GB
100
480 GB
945
240 GB
140
800 GB
1663
300 GB
225
960 GB
1750
600 GB
330
1200 GB
2455
Step 5: Select the SSD device,
column 1
,
which corresponds to the selected value in
column 2
.
Step 6. Check that the size of the selected SSD is greater than required size of the SSD, if not select the size of the
SSD that match customer requirements.
Содержание Hatteland Display HT B22G Series
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