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맥미니가 가끔 프리징이 일어나서 램테스트를 해봤습니다.
4G RAM 이 2개 꼽혀있는데 아래와 같은 에러가 나옵니다. 
한개씩 꼽아보고 테스트를 해봐야 하나요?

Apple-Image:~ appleimage$ memtest all

Memtest version 4.22 (64-bit)
Copyright (C) 2004 Charles Cazabon
Copyright (C) 2004-2008 Tony Scaminaci (Macintosh port)
Licensed under the GNU General Public License version 2 only

Mac OS X 10.6.8 (10K549) running in multiuser mode
Memory Page Size: 4096
System has 2 Intel core(s) with SSE
Requested memory: 5065MB (5311381504 bytes)
Available memory: 5065MB (5311381504 bytes)
Allocated memory: 5065MB (5311381504 bytes) at local address 0x0000000101000000
Attempting memory lock... ERROR: Memory lock failed - reason unknown.

WARNING: Testing with unlocked memory may be slower and less reliable

Partitioning memory into 2 comparison buffers...
Buffer A: 2532MB (2655690752 bytes) starts at local address 0x0000000101000000
Buffer B: 2532MB (2655690752 bytes) starts at local address 0x000000019f4aa000

Running 1 test sequence... (CTRL-C to quit)

Test sequence 1 of 1:

Running tests on full 5065MB region...
  Stuck Address       : ok              
  Linear PRN          : ok              
Running comparison tests using 2532MB buffers...
  Random Value        : ok 
  Compare XOR         : ok 
  Compare SUB         : ok 
  Compare MUL         : ok 
  Compare DIV         : ok 
  Compare OR          : ok 
  Compare AND         : ok 
  Sequential Increment: ok 
  Solid Bits          : ok              
  Block Sequential    : ok                 
  Checkerboard        : ok              
  Bit Spread          : ok                
  Bit Flip            : testing 146 of 512

FAILURE! Data mismatch at local BUFA address 0x0000000114b47380, BUFB address 0x00000001b2ff1380
BUFA Data: 0x0000000000000000, BUFB Data: 0x0000000000040000

  Walking Ones        : ok                
  Walking Zeroes      : ok                

*** Memory Test Failed ***  Please check transcript for details.
Execution time: 3611 seconds.

...
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