please help, immediately , I need ro rush back to the shop if these are counterfeit to get my money back
1 Like
Hi @sandanuwan,
The cards you have here are confirmed authentic SDSDXXU-064G-GN4IN units. The serial numbers being identical is normal, in this particular instance. These cards were most likely manufactured on the same day, in the same manufacturing center.
1 Like
Are the RescuePro serial numbers identical?
“These cards were most likely manufactured on the same day”
Can you confirm this not guessing ,
those are different and working
Your card’s serial number is BN25078001721Z.
This page suggests that the correct serial number format is CCYYDDDXXXXXL.
BN25078001721Z
CCYYDDDXXXXXL
CC = BN - product code ??
YY = (20)25 - year
DDD = 078 - day
XXXXX = unique s/n
L = location of manufacture ?
Clearly, your s/n has an extra X.
Here is a genuine card:
The s/n is BP1832551766G.
Another one (BP2005153036G):
https://images.uzum.uz/cf8hdrgv1htd23algddg/original.jpg (BN22295001718G)
https://www.storagereview.com/wp-content/uploads/2014/06/StorageReview-SanDisk-Ultra-Plus-Memory-Card-Bottom.jpg (BM1334150100G)
https://bulkmemorycards.com/wp-content/uploads/2023/03/Serial-Compare-scaled.jpg (BP2035053593Y & BP2031453594Z)
https://www.outsidetheshot.com/images/memory-cards/sd-card-contacts_hu_298910aa0e1cc613.webp (BL1229822505G)
Summary:
CCYYDDDXXXXXL (SanDisk web site)
BL1229822505G (outsidetheshot.com)
BM1334150100G (storagereview.com)
BP1832551766G (cameramemoryspeed.com review)
BP2005153036G (shashinki.com, vendor)
BP2031453594Z (bulkmemorycards.com)
BP2035053593Y (bulkmemorycards.com)
BN22295001718G (uzum.uz, vendor)
BN25078001721Z (yours)
Do all the latest cards have an extra digit in the s/n?
Hey, look at this:
The 5 Best Memory Cards of 2025:
This is a photo from that review:
The s/n on the UHS-1 card is BM22122001721Z. That’s day #122 of 2022. Compare that s/n against your own:
BN25078001721Z
BM22122001721Z
YYDDD^^^^^^L
Notice that all the digits except the date are identical. What are the odds of that?
CCYYDDDXXXXXL (SanDisk web site)
BL1229822505G (outsidetheshot.com)
BM1334150100G (storagereview.com)
BN1615950860G (eBay) <-- recently edited
BP1832551766G (cameramemoryspeed.com, review)
BP2005153036G (shashinki.com, vendor)
BP2031453594Z (bulkmemorycards.com)
BP2035053593Y (bulkmemorycards.com)
BM22122001721Z (techgearlab.com)
BN22295001718G (uzum.uz, vendor)
BN25078001721Z (yours)
YYDDD^^^^^^L
This is a summary of the cards in chronological order. Something is different about the last three cards. Firstly, they have an extra digit in the s/n. Secondly, the BM22122001721Z card seems to be out of order. That is, one would expect that a “BM” card would have been manufactured between 2013 and 2018, not 2022. Notice that the last 7 characters are very similar, if not identical.
Edit:
Here is a BN card from eBay:
s/n = BN1615950860G
That has the correct number of digits, plus the manufacture date fits in between the BM and BP cards, as you would expect for alphabetical order.
Edit:
BP2031453594Z (bulkmemorycards.com)
BP2035053593Y (bulkmemorycards.com)
YYDDD^^^^^L
The article would suggest that these two cards may have been procured at the same time. Their manufacture dates differ by 36 days, yet their serial numbers are almost identical. Are these fakes, too?
I draw your attention to this knowledge base article:
" Product Model and Date Code Table
---------------> Serial Numbers are unique. <---------------
Internal SSD, External SSD, Extreme PRO CompactFlash, and CFast Cards have serial numbers"
Edit:
After more research, I believe that the number of the SD card is a “date code” rather than a serial number. If so, then SanDisk’s technical article has numerous errors, and this number need not be unique.
SanDisk’s tech article states that “Serial Numbers are unique” and “Date Codes are not unique”.
CFexpress Card - Serial Number on the product - YYWWLLMXXXXX
CompactFlash Card - Serial Number on the product - YWWDMTLLLXXX
microSD and microSD Express Card - Date Code on the product - YWWDMTLLLXXX + CC
SD and SD Express Card - Serial Number on the product - CCYYDDDXXXXXL
USB Flash Drives - Date Code on the product
Notice that the CompactFlash and microSD cards have the same number format, but different description. Something is wrong here.
I also noticed that USB flash drives appear to have a numbering format of CCYYMMXXXXXL.
SanDisk Ultra USB flash drive
BL121024800B China https://ounapuu.ee/posts/2023/02/15/shrinkflation/media/image-2.jpg
BL131024746B China https://www.rflashdata.com/wp-content/uploads/2015/08/Sandisk-Ultra-USB-3.0.jpg
BN140824800B China https://img.danawa.com/prod_img/500000/831/196/img/2196831_4.jpg?_v=20181120134925
BM151125257B China https://ae01.alicdn.com/kf/S1ef3815c1f57410aa7e762ea4c511edcP.jpg
BL171125745W Malaysia https://i.ebayimg.com/images/g/F88AAOSwk~Rm~A1v/s-l1600.webp
BM171226162B China https://i.ebayimg.com/images/g/2UAAAOSwD4RctZj4/s-l1600.webp
BP20120017644 Malaysia https://archive.goughlui.com/wp-content/uploads/2021/10/2021101309479736.jpg
BP2107002263W Malaysia https://imgur.com/LmbhQ25
BP2108004404W Malaysia https://imgur.com/LmbhQ25
BR220258047W Malaysia https://i5-richmedia.walmartimages.com/asr-rm/f247c89b-ca69-49e2-bae0-e86330ec52af_360_merchant_manual_12.jpg
BN22050031084 Malaysia https://sg-test-11.slatic.net/other/roc/a64b2a0622494326cd6322895f7893d4.jpg
BL2210001378W Malaysia https://ounapuu.ee/posts/2023/02/15/shrinkflation/media/image-2.jpg
BQ2304005965W Malaysia https://ugc-user-content.pccomponentes.com/IMG_658064cd8525c_20231218152709545370.jpg
BN2311001183Z China 3-pack https://cdn.idealo.com/folder/Product/201934/6/201934693/s1_produktbild_max_8/sandisk-ultra-usb-3-0-64gb-3-pack.jpg
I found this official SanDisk document that describes the marking spec of an AirCruzer wireless flash drive:
CCYYMMXXXXXL
CC = Memory Capacity
YY = Year: 12=2012
MM = Work Month: 01-12
XXXXX = Technology Code (5 digits starting from 54-98-XXXXX)
L = Subcontractor Code
The mysterious XXXXX digits represent a “Technology Code”, so they are probably not unique.
Other SanDisk marking specs:
iXpand™ Memory Case:
Ixpand Wireless Charger 15W:
I also found this “Time Shift Buffer Hardware Specification”:
https://account.cablelabs.com/server/alfresco/b5172002-e439-4eb4-9d67-2e5054b1d3bc
The SD card looks very much like SanDisk’s cards. In this case the mysterious XXXXX digits are the “Last 5 digits from Bill of Materials”.
6.1.3 SD Card Labeling
Each SD Card MUST have the following labeling on the bottom of the card etched in during manufacturing:
• Card Capacity Code (CC). See Table 4 for code mapping to capacity.
• YYDDD to indicate the year and day in that year when the card was manufactured
• Last 5 digits from Bill of Materials
• Single character Manufacturing site indicator
• Memory lot identifier
Table 4 - Capacity Code Mapping
Capacity Code Size
------------- ------
BH 4 GB
BI 8 GB
BL 16 GB
BM 32 GB
BN 64 GB
BP 128 GB
My reply was a statement, not a guess.
Could you now please correct the errors in SanDisk’s knowledge base article? I prefer to rely on official documentation, but I wasted many hours after SanDisk’s errors steered me in the wrong direction.
The correct answer to the OP’s question is that the number on the card is not a serial number, as incorrectly identified in that article. However, that article correctly states that serial numbers are unique, hence the confusion.
BTW, this was my previous experience with Western Digital TS. They incorrectly identified a 10-year-old relabelled Hitachi drive as a new WD Red Pro.
https://community.wd.com/t/wd-red-from-china-is-it-legit/473434/17
Moreover, no-one can say that something is genuine simply by examining a photograph. If SanDisk really cared about stamping out counterfeiting, they would provide a tool to interrogate the card at the firmware level, something like ChipGenius.
I also got the same problem. both cards have the same serial numbers
