Microsoft Office Tutorials and References
In Depth Information
Selecting an SSD
4 K random Queue Depth 32 read and write —Similar to the other random
tests, although this benchmark uses enhanced features of newer drives such as
NCQ and the AHCI protocol that provide a queue that can help performance.
I ran the test on a traditional hard drive, an entry-level SSD, and a
highperformance SATA Rev 3 (6 Gbps) SSD. Table 16-1 shows the read-performance
comparison and Table 16-2 shows the write-performance.
Table 16-1: Drive Read Performance Comparison
RANDOM
512K
RANDOM 4K
QD32
DRIVE
SEQUENTIAL
RANDOM 4K
Traditional
HDD
67 MB/s
7.7 MB/s
0.39 MB/s
0.44 MB/s
Entry Level
SSD
124 MB/s
120 MB/s
18 MB/s
16 MB/s
High-End SSD
467 MB/s
457 MB/s
26.97 MB/s
222 MB/s
Table 16.2: Drive Write Performance Comparison
RANDOM
512K
RANDOM 4K
QD32
DRIVE
SEQUENTIAL
RANDOM 4K
Traditional
HDD
67 MB/s
13 MB/s
0.76 MB/s
0.74 MB/s
Entry Level
SSD
127 MB/s
108 MB/s
10 MB/s
14 MB/s
High-End SSD
251 MB/s
239 MB/s
54 MB/s
205 MB/s
The results of the test show how the solid state drives destroy the traditional
hard drive on sequential and random IO. The actual results from running this
test will vary depending on the model of SSD that you purchase and on your
hardware. Keep in mind the results on the performance tables will be outdated
by the time this topic is published because faster solid state disks are released
very frequently. However, the tables are still useful for showing you the big
difference between traditional and solid state disks. By the time you read this,
the difference will just be greater.
Selecting an SSD
All of the consumer solid state drives on the market use a type of lash memory
called NAND that retains data even when the power is off. When SSDs first
became popular, they were primarily made up of single-level cell or SLC NAND
memory chips. SLC NAND stores one bit per cell, such as a 0 or 1. Performance
and wear durability was great but the technology was very expensive.
 
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