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Tested unit(Serial No.)

・TDK SATA 3 Gbps SSD (32GB SDG2A32G)・TDK SATA 3 Gbps SSD (64GB SDG2A64G）The following SSDs were selected as the standards for comparison.・SSD of Company A (80GB SATA2)・SSD of Company B (64GB SATA2)

Test date Start 9/16/2011 10:00 End 9/17/2011 10:00

Tester measuring instrument

Manufactured by Daichu Technologies Co., Ltd.HDD/SSD Tester D010

Test location Yokohama Office

Test environment Normal temperature, Power supply (input) 100 V Examiner Takeshi Shindo, Development Engineering Dept.

Test contents Program： cerioso3.0.0-23

Data write specifications: Number of transfer blocks: 128 sectors, write data amount: 2GBWrite data pattern: original specifications of Daichu Technologies Co., Ltd.

Power interruption specifications: A short interruption lasting 2 to 3 milli seconds is caused 5 seconds after the start of data writing.

Data validation method: The data written during the power interruption and the written LBA data are read and compared.

Test Cell： 1: TDK SATA 3 Gbps SSD (32GB SDG2A32G)2: TDK SATA 3 Gbps SSD (64GB SDG2A64G）3: SSD of Company A4: SSD of Company B

Test duration: 24 hours

[Power interruption test image]

SATA data line

Power line

Write command

Data comparison

Read command

Power interruption(2ms to 3ms)

Count at the time of a data mismatch event

Result It has become clear that correct data was written to the TDK 3Gbps SSD SDG2A, for both the 32GB and 64GB models, from the result that no differences were observed in the data when interruptions were caused during data writing. Data differences were observed in the SSDs of company A and company B selected as the comparison standards, indicating that data may not have been written correctly during power interruptions, even though no data write errors occurred.

Data write amount (sector), number of power interruptions and number of data mismatch events in the 24-hour continuous data write operation

TDK (32GB) TDK (64GB) Company A Company B

Data write amount 2837558584 1676135656 3966531026 2015419396

Mismatched data amount 0 0 54967 4352

Number of power interruptions 677 400 946 481 Number of data mismatch events(Occurrence rate[%])

0 (0)

0 (0)

859 (91)

68 (14)

* The number of power interruptions differs according to the write speed of each drive.

Judgment criterion There is no difference in data caused by power interruptions during data writing to the TDK SATA 3 Gbps SSD SDG 2A.

Judgment OK

SSD Power Interruption Resistance Test Results

Product name (Unit name): TDK SATA 3 Gbps SSD SDG2A series

Test item: SSD power interruption test

Test purpose: To check whether data is correctly written to the drive during power interruptions.

Created on: 9/17/2011

Created by: Development Engineering Dept.

Approval Inspection Staff in charge

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Detailed materials

Power interruption test flow chart (See p.3, p.4)

Start of processing

Processing complete

Data differences exist

Errors exist

No data differences

No errors

Loop

24 hourloop

Initialization

Data write (Special pattern)

2 to 3ms short interruption 5s later

Error processingData comparisonData difference

Mismatched data count

Data write errors during short interruption

SSD mounting Test screen

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1. Software startup/test execution

1) Screen after login

Double-click “HDD/SSD Tester” on the screen to start the main screen.

2) Main screen

＊ This is an example of the screen following startup. The status changes depending on the sequence program or the previous setting.

[Reference] Power interruption test operation procedure

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3) Power interruption sequence selection

Select the power interruption sequence from the pull-down menu for each cell.

Sequence selection menu

4) Execution of the power interruption sequence

Select the cell to be tested and click Start to execute the test.