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SSD Selection Guide
Calculation of required size of SSD (Multi-Level Cell - MLC) device)
The table below details the write endurance of the Intel® SSD 320 Series in an enterprise environment. Write
endurance is measured while running 100% random 4KB (4096 bytes) writes spanning 100% of the drive using
Iometer.
Write Endurance Specifications
Intel® SSD 320 Series
40 GB
80 GB
120 GB
160 GB
300 GB
600 GB
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
Step 3: Calculate total amount of data written to the SSD during its whole lifetime,
Step 4: Use table,
column
Write Endurance Specifications
Intel® SSD 320 Series
40 GB
80 GB
120 GB
160 GB
300 GB
600 GB
Step 5: Select the SSD device,
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.
Appendix
IND100077-130
Value in TB (Terabytes)
5
10
15
15
30
60
2, the
z
value shall be less or equal to the value in the table to achieve requested lifetime.
Value in TB (Terabytes)
5
10
15
15
30
60
column
1, which corresponds to the selected value in
x
[year].
73
z
=
y
* x.
column
2.
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