MongoDB crash when PC not proper shutdown

repair and restart
1. start mongod, log indicate mongd unclean shutdown detect, Please visit http://dochub.mongodb.org/core/repair for recovery instructions. the service shutdown automatically
2. repair mongodb with mongod -repair
3. start mongod again, service start

start mongd
mongod --help for help and startup options
2015-02-10T10:04:01.893+0800
2015-02-10T10:04:01.903+0800 warning: 32-bit servers don't have journaling enabl
ed by default. Please use --journal if you want durability.
2015-02-10T10:04:01.903+0800
2015-02-10T10:04:01.943+0800 [initandlisten] MongoDB starting : pid=6836 port=27
017 dbpath=\data\db\ 32-bit host=WN7-9Q2H12S
2015-02-10T10:04:01.943+0800 [initandlisten]
2015-02-10T10:04:01.943+0800 [initandlisten] ** NOTE: This is a 32 bit MongoDB b
inary.
2015-02-10T10:04:01.953+0800 [initandlisten] **       32 bit builds are limited
to less than 2GB of data (or less with --journal).
2015-02-10T10:04:01.953+0800 [initandlisten] **       Note that journaling defau
lts to off for 32 bit and is currently off.
2015-02-10T10:04:01.963+0800 [initandlisten] **       See http://dochub.mongodb.
org/core/32bit
2015-02-10T10:04:01.963+0800 [initandlisten]
2015-02-10T10:04:01.963+0800 [initandlisten] targetMinOS: Windows XP SP3
2015-02-10T10:04:01.963+0800 [initandlisten] db version v2.6.7
2015-02-10T10:04:01.973+0800 [initandlisten] git version: a7d57ad27c382de82e9cb9
3bf983a80fd9ac9899
2015-02-10T10:04:01.973+0800 [initandlisten] build info: windows sys.getwindowsv
ersion(major=6, minor=1, build=7601, platform=2, service_pack='Service Pack 1')
BOOST_LIB_VERSION=1_49
2015-02-10T10:04:01.983+0800 [initandlisten] allocator: system
2015-02-10T10:04:01.983+0800 [initandlisten] options: {}
**************
Unclean shutdown detected.
Please visit http://dochub.mongodb.org/core/repair for recovery instructions.
*************
2015-02-10T10:04:02.063+0800 [initandlisten] exception in initAndListen: 12596 o
ld lock file, terminating
2015-02-10T10:04:02.073+0800 [initandlisten] dbexit:
2015-02-10T10:04:02.073+0800 [initandlisten] shutdown: going to close listening
sockets...
2015-02-10T10:04:02.073+0800 [initandlisten] shutdown: going to flush diaglog...

2015-02-10T10:04:02.083+0800 [initandlisten] shutdown: going to close sockets...

2015-02-10T10:04:02.083+0800 [initandlisten] shutdown: waiting for fs preallocat
or...
2015-02-10T10:04:02.093+0800 [initandlisten] shutdown: closing all files...
2015-02-10T10:04:02.093+0800 [initandlisten] closeAllFiles() finished
2015-02-10T10:04:02.093+0800 [initandlisten] dbexit: really exiting now




-- start repair
mongod -repair
2015-02-10T10:20:44.637+0800
2015-02-10T10:20:44.644+0800 warning: 32-bit servers don't have journaling enabl
ed by default. Please use --journal if you want durability.
2015-02-10T10:20:44.648+0800
2015-02-10T10:20:44.681+0800 [initandlisten] MongoDB starting : pid=7224 port=27
017 dbpath=\data\db\ 32-bit host=WN7-9Q2H12S
2015-02-10T10:20:44.684+0800 [initandlisten]
2015-02-10T10:20:44.687+0800 [initandlisten] ** NOTE: This is a 32 bit MongoDB b
inary.
2015-02-10T10:20:44.694+0800 [initandlisten] **       32 bit builds are limited
to less than 2GB of data (or less with --journal).
2015-02-10T10:20:44.697+0800 [initandlisten] **       Note that journaling defau
lts to off for 32 bit and is currently off.
2015-02-10T10:20:44.700+0800 [initandlisten] **       See http://dochub.mongodb.
org/core/32bit
2015-02-10T10:20:44.703+0800 [initandlisten]
2015-02-10T10:20:44.705+0800 [initandlisten] targetMinOS: Windows XP SP3
2015-02-10T10:20:44.708+0800 [initandlisten] db version v2.6.7
2015-02-10T10:20:44.712+0800 [initandlisten] git version: a7d57ad27c382de82e9cb9
3bf983a80fd9ac9899
2015-02-10T10:20:44.721+0800 [initandlisten] build info: windows sys.getwindowsv
ersion(major=6, minor=1, build=7601, platform=2, service_pack='Service Pack 1')
BOOST_LIB_VERSION=1_49
2015-02-10T10:20:44.725+0800 [initandlisten] allocator: system
2015-02-10T10:20:44.729+0800 [initandlisten] options: { repair: true }
2015-02-10T10:20:44.821+0800 [initandlisten] repairDatabase local
2015-02-10T10:20:44.829+0800 [initandlisten] allocating new ns file \data\db\_tm
p_repairDatabase_0\local.ns, filling with zeroes...
2015-02-10T10:20:46.299+0800 [FileAllocator] allocating new datafile \data\db\_t
mp_repairDatabase_0\local.0, filling with zeroes...
2015-02-10T10:20:46.305+0800 [FileAllocator] creating directory \data\db\_tmp_re
pairDatabase_0\_tmp
2015-02-10T10:20:47.261+0800 [FileAllocator] done allocating datafile \data\db\_
tmp_repairDatabase_0\local.0, size: 64MB,  took 0.946 secs
2015-02-10T10:20:50.371+0800 [initandlisten] repairDatabase pcat
2015-02-10T10:20:50.379+0800 [initandlisten] allocating new ns file \data\db\_tm
p_repairDatabase_0\pcat.ns, filling with zeroes...
2015-02-10T10:20:51.327+0800 [FileAllocator] allocating new datafile \data\db\_t
mp_repairDatabase_0\pcat.0, filling with zeroes...
2015-02-10T10:20:51.331+0800 [FileAllocator] creating directory \data\db\_tmp_re
pairDatabase_0\_tmp
2015-02-10T10:20:52.087+0800 [FileAllocator] done allocating datafile \data\db\_
tmp_repairDatabase_0\pcat.0, size: 64MB,  took 0.69 secs
2015-02-10T10:20:58.202+0800 [initandlisten] finished checking dbs
2015-02-10T10:20:58.202+0800 [initandlisten] dbexit:
2015-02-10T10:20:58.202+0800 [initandlisten] shutdown: going to close listening
sockets...
2015-02-10T10:20:58.202+0800 [initandlisten] shutdown: going to flush diaglog...

2015-02-10T10:20:58.202+0800 [initandlisten] shutdown: going to close sockets...

2015-02-10T10:20:58.212+0800 [initandlisten] shutdown: waiting for fs preallocat
or...
2015-02-10T10:20:58.222+0800 [initandlisten] shutdown: closing all files...
2015-02-10T10:20:58.222+0800 [initandlisten] closeAllFiles() finished
2015-02-10T10:20:58.232+0800 [initandlisten] shutdown: removing fs lock...
2015-02-10T10:20:58.232+0800 [initandlisten] dbexit: really exiting now

--service start
mongod
mongod --help for help and startup options
2015-02-10T10:21:53.965+0800
2015-02-10T10:21:54.065+0800 warning: 32-bit servers don't have journaling enabl
ed by default. Please use --journal if you want durability.
2015-02-10T10:21:54.065+0800
2015-02-10T10:21:54.095+0800 [initandlisten] MongoDB starting : pid=4208 port=27
017 dbpath=\data\db\ 32-bit host=WN7-9Q2H12S
2015-02-10T10:21:54.095+0800 [initandlisten]
2015-02-10T10:21:54.095+0800 [initandlisten] ** NOTE: This is a 32 bit MongoDB b
inary.
2015-02-10T10:21:54.095+0800 [initandlisten] **       32 bit builds are limited
to less than 2GB of data (or less with --journal).
2015-02-10T10:21:54.095+0800 [initandlisten] **       Note that journaling defau
lts to off for 32 bit and is currently off.
2015-02-10T10:21:54.095+0800 [initandlisten] **       See http://dochub.mongodb.
org/core/32bit
2015-02-10T10:21:54.095+0800 [initandlisten]
2015-02-10T10:21:54.095+0800 [initandlisten] targetMinOS: Windows XP SP3
2015-02-10T10:21:54.095+0800 [initandlisten] db version v2.6.7
2015-02-10T10:21:54.095+0800 [initandlisten] git version: a7d57ad27c382de82e9cb9
3bf983a80fd9ac9899
2015-02-10T10:21:54.095+0800 [initandlisten] build info: windows sys.getwindowsv
ersion(major=6, minor=1, build=7601, platform=2, service_pack='Service Pack 1')
BOOST_LIB_VERSION=1_49
2015-02-10T10:21:54.105+0800 [initandlisten] allocator: system
2015-02-10T10:21:54.105+0800 [initandlisten] options: {}
2015-02-10T10:21:54.145+0800 [initandlisten] waiting for connections on port 270
17