what is wrong with 32GB Fake drive
Hi,
There can be three issues regarding such fraud.
1) Confusion with storage unit---------------------------------"b"-- bit & "B"---Byte ( 8b=1B).
2)System Design issue-------------------------------------------Linked with project design
3) Memory & Microprocessor design issue Chip-------- linked with Semiconductor Comp.
Confusion with storage unit:--
Most of us know about this that 1Byte=8bits, letter "B"(Capital) is for Byte & letter "b"(small) for bit so some online seller can make you fool.....in their ad. they can write 8Gb for a 1GB Memory..
System Design issue:-
What is in a USB pen drive??
USB connector===>Microcontroller chip===>NAND memory chip
USB connector have 4 pins( 2 for power supply( 5Volt & Gnd).. 2 pins for signal ( technically known as D+ & D-)), PC provides 5V to USB devices.
Inside the memory chip there is a voltage regulator chip to convert 5V supply to a 3.3V or 2.5V depending on Microcontroller & Memory chip
There can be two places of error, One Microcontroller & IInd Memory chip.
1) Error with microcontroller (To understand this one need to know USB protocol, I m not explaing all but in small & only relevent) When u connect any USB device( nay device), Microcontroller talks with PC ,this process called Enumeration, in this USB device send data about that device, eg. what type of device, comp. name, product name, Driver location and lots of other information.. and all this data is programmable & stored in Microcontroller.. telling size of Pen drive is also part of this Enumeration. By mistake or fraud one can even show a 1000GB pen drive for a 1GB.. ...that can be happening here... 32GB fake for 512MB/1GB
2) Error with memory Chip:-
This is Storage where pen drive store data... one can format "FAT/NTFS" depending on Microcontroller's firmware..
about FAT & NTFS, a OS engineer can explain better then me.....So related to this Fraud.. one can solder smaller memory & in Microcontroller Programed it a bigger value..... "That is happing here".. if some one open this fake drive & check Memory part no. Google.. that chip will be either 512MB or 1GB.... what is know to "embedded product designer"
So to buyer of this FAKE pen drive Plz try to put small file & read back... note down biggest file u stores & also retrieved...that is actual size of ur pen drive.
One example may clear this issue, in 2001 one my Project was "USB Data logger"..at that time there was nothing on Google search .
I was using 256KB memory in my design ( At that time 16MB was biggest size available)... In one day I was playing with source code of enumeration process to display my name as Company name, I don't remember what I did but when I connected to PC this was showing 64MB as memory. but when I was writing to this more then 256KB , data was overwritten ( we were not using any format like FAT or NTFS) so we were lossing all information. But if one is using FAT/FTFS then ur data might be corrupt but there will be information about File, like file name, date,file size.. again an OS engineer can tell explain more on this.
Memory & Microprocessor design issue Chip:-
There are very rare chances of some issue regarding Semiconductor design.....very long to explain.
In totaly non technically explanination..
There is house 32 rooms and there is board at gate to tell what is inside room-- u can put some thing in room & write down on board.. get back & wtite there.... say that is your original 32GB pen drive.
One fraud person made only front wall & placed 32 Gates with board ( to log information about what is inside). When you will count, u will see 32gates & you will assume that there are 32 rooms. .. but actually there is no room ( or say one room to show customers).......-- This is about a 32GB fake drive.
This is really something very disappointing that we have not recieved any expert comment on this serious issue from any of the worthy member on this site and i know we have many Network experts here,,,,,,,
Sarkaar ko is ghatna ke upar ek commission baithana chaahiye
what a noble cause
,,,I have one query,,,,