{"id":279,"date":"2026-07-06T11:37:48","date_gmt":"2026-07-06T04:37:48","guid":{"rendered":"https:\/\/cuudulieu24h.com\/case-study\/?post_type=case_study&p=279"},"modified":"2026-10-12T09:23:49","modified_gmt":"2026-10-12T02:23:49","slug":"cuu-du-lieu-usb-khong-nhan-loi-controller-sm3255q-chip-nand-flash-extractor","status":"publish","type":"case_study","link":"https:\/\/cuudulieu24h.com\/case-study\/cuu-du-lieu-usb-khong-nhan-loi-controller-sm3255q-chip-nand-flash-extractor\/","title":{"rendered":"C\u1ee9u D\u1eef Li\u1ec7u USB Kh\u00f4ng Nh\u1eadn Khi C\u1eafm V\u00e0o M\u00e1y T\u00ednh \u2013 L\u1ed7i Controller Silicon Motion SM3255Q-AB, Ph\u1ee5c H\u1ed3i Chip NAND Dynet B\u1eb1ng Flash Extractor"},"content":{"rendered":"

M\u1ed9t chi\u1ebfc USB 4GB c\u1eafm v\u00e0o m\u00e1y t\u00ednh \u2014 kh\u00f4ng m\u1ed9t ti\u1ebfng “ting”, kh\u00f4ng k\u00fd t\u1ef1 \u1ed5 \u0111\u0129a, Explorer im l\u1eb7ng nh\u01b0 ch\u01b0a c\u00f3 g\u00ec \u0111\u01b0\u1ee3c c\u1eafm v\u00e0o. V\u1edbi ch\u1ee7 nh\u00e2n n\u00f3, \u0111\u00f3 l\u00e0 kho\u1ea3nh kh\u1eafc l\u1ea1nh ng\u01b0\u1eddi: b\u00ean trong l\u00e0 \u1ea3nh, t\u00e0i li\u1ec7u v\u00e0 d\u1eef li\u1ec7u t\u00edch c\u00f3p su\u1ed1t g\u1ea7n m\u01b0\u1eddi n\u0103m.<\/p>\n

Nh\u01b0ng “USB kh\u00f4ng nh\u1eadn” g\u1ea7n nh\u01b0 ch\u01b0a bao gi\u1edd \u0111\u1ed3ng ngh\u0129a v\u1edbi “m\u1ea5t h\u1ebft”. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 nh\u1eadt k\u00fd \u0111\u1ea7y \u0111\u1ee7 m\u1ed9t ca ch\u00fang t\u00f4i \u0111\u00e3 x\u1eed l\u00fd \u2014 t\u1eeb l\u00fac ch\u1ea9n \u0111o\u00e1n \u0111\u1ebfn khi c\u00e2y th\u01b0 m\u1ee5c hi\u1ec7n ra nguy\u00ean v\u1eb9n \u2014 k\u00e8m c\u1ea3 nh\u1eefng vi\u1ec7c b\u1ea1n n\u00ean v\u00e0 tuy\u1ec7t \u0111\u1ed1i kh\u00f4ng n\u00ean l\u00e0m khi g\u1eb7p t\u00ecnh hu\u1ed1ng n\u00e0y.<\/p>\n

\n
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4GB<\/div>\n
Dung l\u01b0\u1ee3ng USB<\/div>\n<\/div>\n
\n
0.6%<\/div>\n
\u00d4 nh\u1edb l\u1ed7i (ECC Red)<\/div>\n<\/div>\n
\n
30+<\/div>\n
Th\u01b0 m\u1ee5c ph\u1ee5c h\u1ed3i<\/div>\n<\/div>\n
\n
2014\u20132024<\/div>\n
D\u1ea3i d\u1eef li\u1ec7u l\u1ea5y l\u1ea1i<\/div>\n<\/div>\n<\/div>\n

T\u00f3m T\u1eaft Nhanh<\/h2>\n
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\n
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Thi\u1ebft b\u1ecb<\/div>\n
USB Flash Drive 4GB<\/div>\n<\/div>\n
\n
Controller<\/div>\n
Silicon Motion SM3255Q-AB<\/div>\n<\/div>\n
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Chip NAND<\/div>\n
Dynet D27UBG8T2ATR \u2013 32G, TSOP package<\/div>\n<\/div>\n
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PCB<\/div>\n
UDF255-2.0-SM3255-L-4L-2F(LGA TSOP) \u2013 2011-02-15<\/div>\n<\/div>\n
\n
Layout firmware<\/div>\n
SM3254 1066 v3 Xor 0000_256 \/ Assembler: Block Number<\/div>\n<\/div>\n
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File system<\/div>\n
FAT32 \/ MBR<\/div>\n<\/div>\n
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Tri\u1ec7u ch\u1ee9ng<\/div>\n
USB c\u1eafm v\u00e0o m\u00e1y t\u00ednh kh\u00f4ng nh\u1eadn, kh\u00f4ng hi\u1ec3n th\u1ecb trong File Explorer<\/div>\n<\/div>\n
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Nguy\u00ean nh\u00e2n x\u00e1c \u0111\u1ecbnh<\/div>\n
L\u1ed7i firmware\/controller \u2014 chip NAND c\u00f2n nguy\u00ean v\u1eb9n<\/div>\n<\/div>\n
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C\u00f4ng c\u1ee5 x\u1eed l\u00fd<\/div>\n
Flash Extractor<\/div>\n<\/div>\n
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ECC Report<\/div>\n
Green: 5,151,336 \/ Red: 50,146 \/ Grey: 3,187,126 \/ Purple: 0<\/div>\n<\/div>\n
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Th\u1eddi gian scan<\/div>\n
30,437ms (ECC) + 47ms (FAT32) + 281ms (scan l\u1ea1i x\u00e1c nh\u1eadn)<\/div>\n<\/div>\n
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K\u1ebft qu\u1ea3<\/div>\n
C\u00e2y th\u01b0 m\u1ee5c FAT32 \u0111\u1ea7y \u0111\u1ee7, 30+ th\u01b0 m\u1ee5c, file t\u1eeb 2014\u20132024<\/div>\n<\/div>\n
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T\u1ef7 l\u1ec7 ph\u1ee5c h\u1ed3i<\/div>\n
Cao \u2014 to\u00e0n b\u1ed9 d\u1eef li\u1ec7u tr\u00ean v\u00f9ng Green \u0111\u1ecdc \u0111\u01b0\u1ee3c<\/div>\n<\/div>\n
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M\u1ee9c \u0111\u1ed9 x\u00e1c minh<\/div>\n
Cao \u2014 \u1ea3nh macro chip th\u1ef1c t\u1ebf + 3 screenshot k\u1ef9 thu\u1eadt<\/div>\n<\/div>\n<\/div>\n<\/div>\n

B\u1ed1i C\u1ea3nh v\u00e0 Nhu C\u1ea7u D\u1eef Li\u1ec7u<\/h2>\n

\"Chip<\/p>\n

USB flash drive 4GB \u0111\u01b0\u1ee3c \u0111\u01b0a \u0111\u1ebfn C\u00f4ng ty Kh\u00f4i Ph\u1ee5c D\u1eef Li\u1ec7u V\u00f5 Nguy\u1ec5n, 201B Ho\u00e0ng V\u0103n Th\u1ee5, P. Ph\u00fa Nhu\u1eadn, TP.HCM v\u1edbi tri\u1ec7u ch\u1ee9ng: c\u1eafm v\u00e0o m\u00e1y t\u00ednh kh\u00f4ng nh\u1eadn<\/strong> \u2014 kh\u00f4ng xu\u1ea5t hi\u1ec7n trong File Explorer, kh\u00f4ng hi\u1ec3n th\u1ecb trong Disk Management.<\/p>\n

Chi\u1ebfc USB n\u00e0y ch\u1ee9a d\u1eef li\u1ec7u c\u00e1 nh\u00e2n t\u00edch l\u0169y nhi\u1ec1u n\u0103m \u2014 t\u1eeb \u1ea3nh gia \u0111\u00ecnh, t\u00e0i li\u1ec7u b\u1ea3o hi\u1ec3m, h\u1ed3 s\u01a1 c\u00f4ng vi\u1ec7c \u0111\u1ebfn c\u00e1c file t\u00e0i ch\u00ednh quan tr\u1ecdng (timestamps tr\u1ea3i d\u00e0i t\u1eeb 2014 \u0111\u1ebfn 2024). Kh\u00f4ng c\u00f3 b\u1ea3n sao l\u01b0u<\/strong>.<\/p>\n

Sau khi th\u00e1o v\u1ecf USB v\u00e0 quan s\u00e1t d\u01b0\u1edbi k\u00ednh hi\u1ec3n vi, x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c:<\/p>\n