Stack Overflow
Stack Overflow

Questions tagged [fat]

FAT short for File Allocation Table is the name of a computer file system architecture and a family of industry standard file systems utilizing it.

188 questions
3
votes
2 answers

File-Allocation Table (FAT) - How is Random-Access allowed?

Here comes a straight-forward question about random access when it comes to file systems using FAT. I have seen different explanations of FAT with different kinds of pictures/animations showing different things. I don't understand how random access…
Simon
  • 470
  • 1
  • 7
  • 22
3
votes
3 answers

Logging 16-bit data to an SD card at the rate of 44 kHz

I am using the STM32F4 microcontroller with a microSD card. I am capturing analogue data via DMA. I am using a double buffer, taking 1280 (10*128 - 10 FFTs) samples at a time. When one buffer is full I am setting a flag and I then look at 128…
user3122700
  • 39
  • 2
3
votes
2 answers

How to traverse a FAT directory, file

I am trying to understand how a FAT file system works. From the attached first sector of FAT 16 partition I could understand, Bytes per sector = 512. Sectors per cluster = 4. FAT 16 file system. reserved sectors = 4. FAT table count = 2. Number of…
prasannatsm
  • 900
  • 1
  • 11
  • 19
3
votes
2 answers

Weird standard for FAT32 >4gb files

I have recently encountered an embedded system with IDE drives that are FAT32 but have >4gb files. It appears to do this by setting the file size in the 32byte directory entry to how many bytes the final cluster uses - instead of being the actual…
kiasecto
3
votes
1 answer

Programmatically accessing the Windows file allocation table

How can I programmatically access the file allocation entries (FAT) in Windows? I have read the articles which mention reading entries at a particular address in the harddisk, but how can I read those entries from the harddisk. I can try in C, C++,…
Anirudh Goel
  • 4,571
  • 19
  • 79
  • 109
2
votes
2 answers

Why changing directory using elm chan fatfs f_chdir doesnt effect directory structure?

My folder structure is like this : I open a folder then I use f_chdir to change my directory to that folder. The problem is that f_chdir doesn't change my Directory Structure variable. -A1 | A11 | | | A11.mp3 | A12 | | …
Nima Aghayan
  • 109
  • 1
  • 7
2
votes
2 answers

FAT12 file starts at 0x4200 or 0x4400?

Following link http://www.c-jump.com/CIS24/Slides/FAT/lecture.html say Fat12 file starts at 0x4200, but when I use hexeditor watch the floppy image created by following commands, file seems start at 0x4400, and bootloader assembly code used jmp…
lewis
  • 51
  • 3
2
votes
2 answers

Programatically change FAT32 volume serial number

How do I programatically change Volume Serial of a Fat32 partition from C#. I found this example, but it is written with C++ which I don't read well. Could someone please answer a C# code snippet? Update: I can see the C++ function from above…
VOX
  • 2,883
  • 2
  • 33
  • 43
2
votes
1 answer

bad CPU type in executable error from the CLI Provider Perspective

I've my own open-source CLI tool called surmagic. In my latest update, I've built on a different machine, which has an M1 CPU. Before and after publishing I've tested on that machine, via installing the homebrew. And it works as expected. After a…
MGY
  • 7,245
  • 5
  • 41
  • 74
2
votes
0 answers

Use variable in other layer file

I have an assignment that do FAT12 system. Follow the requirement, I need 2 functions to read sector and multi sector. Those functions in HAL layer. I just tested in app (main) layer below: In HAL.c: #define SIZE_OF_SECTOR 512 static FILE* s_pimage…
Nguyễn Phùng Thái Cường
  • 23
  • 2
2
votes
1 answer

How to decide where to put a function in django fat model implemantation

I want to know where to put a function on models that related to multiple models. I have four models: 1- custom user 2- office 3- company 4- vehicle every vehicle, user and office has a foreign key to company. I want to have all vehicles from a…
Bahadır Kacar
  • 43
  • 4
2
votes
0 answers

Fat12 emulation

I implemented FatFS in internal memory of MCU STM32 Chan's library. Now I try to emulate bigger volume of flash device to receive large files from PC. I can do it by changing two places of FatFS image: 1. By changing MBR_start + 12 field value of…
user3583807
  • 766
  • 1
  • 8
  • 26
2
votes
0 answers

access resource files in outer jar

I'm writing some microservices (fat jar) which expose some http endpoint using a router. As I like every microservice automatically expose a /doc endpoint which just fetches a /src/main/resource/doc/readme.adoc and renders that to html I created a…
Marco
  • 173
  • 1
  • 3
  • 9
2
votes
1 answer

Why is FAT#2 rarely used?

I read a single-line explanation of FAT#2 from Peter Abel's book IBM PC Assembly Language and Programming. It says: Although FAT2 is still maintained, its use has never been implemented. Wikipedia says: The FAT Region. This typically contains two…
Jee Seok Yoon
  • 4,716
  • 9
  • 32
  • 47
2
votes
5 answers

FAT File system and lots of writes

I am considering using a FAT file system for an embedded data logging application. The logger will only create one file to which it continually appends 40 bytes of data every minute. After a couple years of use this would be over one million write…
PICyourBrain
  • 9,976
  • 26
  • 91
  • 136
1 2
3
…
12 13