Problem in SD-CARD Filesystem

[yudh]

Recently i met a problem, some unreadable files existed in my SD-CARD, and after I format it, the CARD is OK, but after 1 weeks continue running, it appeared again. I try to replace with new CARD, however there is no use.
The card inserted in WINDOWS7 PC shows in below, the filename looks like my data value inserted in database.



Hardware: at91sam9g45 + nandflash + lpddr1
Kernel: linux3.8.1
MMC: at91sam9g45_MMC1, NOT MMC0. formated in PC with FAT32 filesystem, MMC clock set to 33MHz, 133/(2 * (1+1)) = 33, MCK / (2* (CLKDIV + 1)), CLKDIV is set to 1 in HSMIC_MR regsiter.
How can I modify the CLKDIV value? I try to modify <linux/drivers/mmc/host/atmel-mci.c> atmci_set_ios() function.
Mount the card with command : mount -t vfat -o errors=continue /dev/mmcblck0p1 /media/storage；

With SD-CARD I use SQLITE3 database, insert some realtime data per 30 seconds. The app Create a <*.db> file, which is <open()> from power on to power down or reset, never <close>, so the card can not been umounted.

In linux shell, <ls> command printed more debug message:
ls: ./NFAT-fs (mmcblk0p1): error, invalid access to FAT (entry 0x3d672d31)
SELECT. 4,: Input/output error
ls: ./ELECT 5,.200: Input/output error
ls: ./0304,nul.L,N: Input/output error
ls: ./CT 7,200.39,: Input/output error
ls: ./8,20038,.146: Input/output error
ls: ./time_dat.a]:: Input/output error
ls: ./s]S->C.)##: Input/output error
ls: ./c->s)##0.389: Input/output error
ls: ./ST=31;CN.=20: Input/output error
ls: ./01605292.236: Input/output error
ls: ./Flag=N;S.09-: Input/output error
ls: ./g=N;02-R.td=: Input/output error
ls: ./02-flag=.N;0: Input/output error
ls: ./S05-Flag.=n;: Input/output error
ls: ./02-rtd=1.2.8: Input/output error
?????NJW.A?? ???????N.JW1 ????.??? WK??????.??? n!w!??
??NJWA?.t?? ???????N.JW1 ?NHW!?$%.??? a_Rtd],[.Vic nw'????4
??NGWK??.??? ???????N.jw1 D?.?b? an't get. on s encryp.ted
???NHW!?.?k? ???????n.JW1 HW!?@???.??? backup up_down_rec
?NJWA???.??? ???????n.JW1 NGWK????.??? cl?gm???.??? x?5?????.??n
?c.??? ??????.NW( NION SEL.ect data.db ????.???
? CSDB.[T.B_R NJWA?\.?.??? flow_rec.db ????????.NJW
?[select. [i #WCLdGY?.??? TG??????.??n k?.???
???????N.hw! 44:03 da.tab Time]) S.ele log
???????n.jwa ??????NG.WK? WA?x.??? ltime_da.ta]
[root@DATE7300S storage]#

Hope for resolve this problem or give some suggestions.

[yudh]

Please change the problem to <SAM9 ARM9 MPU> forum, I did't found the way to move it, thanks