exfat | Free exFAT file system implementation | File Utils library
kandi X-RAY | exfat Summary
kandi X-RAY | exfat Summary
This project aims to provide a full-featured exFAT file system implementation for Unix-like systems. It consists of a FUSE module (fuse-exfat) and a set of utilities (exfat-utils). Most GNU/Linux distributions already have fuse-exfat and exfat-utils in their repositories, so you can just install and use them. The next chapter describes how to compile them from source.
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QUESTION
Hey I got a couple of errors and I need help to fix them because I can't find a solution for that.
Why am I using an old af version of ubuntu?
- Because I need to build android 4 and the easiest way to get the right versions of the needed packages is to use an older version of ubuntu which is confirmed to work
So please don't tell me to just upgrade to the latest ubuntu
Some commands that don't work because of a failure with ssl
- when trying to access any website with firefox it returns
ssl_error_no_cypher_overlap
BUT google searches are working fine
ANSWER
Answered 2021-Dec-25 at 21:06The problem is not (yet) the certificates, it fails before validating these. Instead the versions of the SSL libraries used a simply too old. This means your software stack is way to old for today's requirements. There is no easy way to fix this.
In detail: The openssl version in 11.10 is 0.9.8 which has no support for modern protocols like TLS 1.2 or even TLS 1.3. Similar the version of Firefox at the time of Ubuntu 11.10 did not support TLS 1.2 either (even though NSS and not openssl was used as SSL library).
QUESTION
I was compiling twrp for moto g40 fusion codenamed hanoip using kernel sources, but got this error /bin/bash: -c: line 0: unexpected EOF while looking for matchin`"'
/bin/bash: -c: line 1: syntax error: unexpected end of file
I got this error when
BOARD_USES_RECOVERY_AS_BOOT := true
But after changing the value to false everything was fine.
The problem here is that BOARD_USES_RECOVERY_AS_BOOT must be true for twrp to boot.
here is the build log when BOARD_USES_RECOVERY_AS_BOOT := true
ANSWER
Answered 2022-Jan-28 at 16:21Can't tell for sure, but (from past experience) this sounds like either a combination of:
Possible cause #1:
- A script failing to properly wrap something like
$PWD
in double-quotes when accessing it. - The script being called from a directory with characters in it (such as a space or a quote) that needs to be quoted. Since you are using WSL, I often would suspect that you may have the project on a Windows drive.
OR
Possible cause #2:
- A script failing to properly wrap
$PATH
in double-quotes when modifying it. - And, since you have this tagged WSL, the Windows path having characters in the path (like spaces) that always need quoting.
- And, the interop feature of WSL that automatically appends the Windows path to the Linux path at startup so that you can run Windows commands (assuming the
.exe
is included) such aspowershell.exe
, Visual Studio Code, and (of course) many others.
In the first case, try building in a different directory, preferably something like ~/src
.
In the second case ...
Usually I would recommend finding and fixing the quoting issue as the first step, but:
- These aren't your scripts
- You don't need to fix this on a permanent basic, just while you are building.
So in this case, I'd recommend trying the build with the Windows path propagation turned off (temporarily). To do this:
QUESTION
I just follow the instructions of this page but found the disk space of folder occupying via create-react-app
command is intimidating 5GB!
But this action above was done on my external disk. I did the same action on my Built-in hard drive and found the disk space of newly created folder is only 244M. Why the difference is so huge and how to resolve it? I guess it is caused by disk fragmentation, but I googled it and it seems that the Mac does not need to be defragmented. My external disk is ExFAT format.
Is this normal? Thank you!
...ANSWER
Answered 2021-Oct-10 at 00:24You have a heck of a lot of small files, your files average about 4kiB each (which is reasonable for source code and similar files)
exFat on large drives defaults to a 128kiB cluster size. This improves performamce with large files, but wastes a lot of space with small ones.
Unfortunately I dob't think you can reduce the cluster size without reformatting,
QUESTION
I'm writing a program that copies the FAT to a file (and restores it). I'm using CreateFile
to open a drive letter as a file, SetFilePointerEx
to seek to 0 position, ReadFile
to read the contents of the drive, and WriteFile
to write to the drive.
Using this strategy I can basically copy the entire drive. However, how should I know where to start and when to stop? Basically, what I want to know is the location of the beginning and the end of File Allocation Table in an exFAT disk.
Here's the code that I use to run the backup for the first 4 GB of data:
...ANSWER
Answered 2021-Aug-07 at 09:31Reading the exFAT specification is a good start.
In §2 ‘Volume structure’, we have a table:
Sub-region Name Offset (sector) Size (sectors) First FAT FatOffset FatLength Second FAT FatOffset + FatLength FatLength × (NumberOfFats − 1)
FatOffset
, FatLength
and NumberOfFats
are fields of the boot sector, as described in §3.1 ‘Main and Backup Boot Sector Sub-regions’:
Field Name Offset (byte) Size (bytes) FatOffset 80 4 FatLength 84 4 NumberOfFats 110 1
The values are in sector units, so you will have to multiply them by the sector size before calling SetFilePointerEx
. The sector size can be obtained from the DeviceIoControl
call IOCTL_DISK_GET_DRIVE_GEOMETRY_EX
; the returned DISK_GEOMETRY_EX
structure contains a Geometry.BytesPerSector
(nested) field. The FatOffset
and FatLength
values are little endian, so you will have to decode them with a function like:
QUESTION
I don't use /dev/sdb and I can't delete it. In Azure->Disks i have only my Os_Disk 30GB, in VM tab in Disks there is also only Os_Disk.
fdisk -l
shows 2 disks:
ANSWER
Answered 2021-Apr-16 at 13:53Azure A_v2-Series VMs have additional temporary disk attached(in your case it is /dev/sdb
)
The temporary disk provides short-term storage for applications and processes, and is intended to only store data such as page or swap files.
Data on the temporary disk may be lost during a maintenance event, shutdown or when you redeploy a VM. During a successful standard reboot of the VM, data on the temporary disk will persist.
https://azure.microsoft.com/en-us/blog/new-av2-series-vm-sizes/
https://docs.microsoft.com/en-us/azure/virtual-machines/managed-disks-overview#temporary-disk
QUESTION
I am new to embedded development and have been tasked with implementing a file system on SPI flash memory. I am using a w25qxx chip and an STM32F4xx on STM32CubeIDE. I have successfully created the basic i/o for the w25 over SPI, being able to write and read sectors at a time.
In my user_diskio.c I have implemented all of the needed i/o methods and have verified that they are properly linked and being called.
in my main.cpp I go to format the drive using f_mkfs()
, then get the free space, and finally open and close a file. However, f_mkfs()
keeps returning FR_MKFS_ABORTED
. (FF_MAX_SS is set to 16384)
ANSWER
Answered 2021-Feb-23 at 21:17Here:
QUESTION
Trying to implement the exFAT boot checksum as described in section 3.4 of:
https://docs.microsoft.com/en-us/windows/win32/fileio/exfat-specification
My code does not produce the correct checksums. :(
...ANSWER
Answered 2021-Feb-20 at 02:59Supposing that there were
QUESTION
Already thanks for your time.
I'm a little lost on how can I debug a problem I have with FatFs: write then read files inside folder brings me invalid data. but on the root, it work flawessly.
note:
- I'm working on a bar-metal nrf52832 using FatFs 14.
- The nrf52832 talk on spi to an external flash MX25L32 (4Mb, 512b/sector, 4096/block)
- I have disabled the relative file path, so I use only absolute path.
- (I'll join "ffconf.h")
I have the following problem :
- If I write then read a file on the root, it work flawlessly (tested with 10k file)
- If I write then read a file in a subfolder I read somethings strange (even with small file).
and here's the code that I use (cb_littlecodethatfail is called via an RTT terminal):
...ANSWER
Answered 2020-Jul-29 at 08:42It's me again,
The bug is inside the glue 'disk_write' function. As long as block was written in the right order, everythings worked well. But it's not always the case.
sorry for my noobness, here's the implementation actual of the disk_write
QUESTION
I have recently bought a USB, which is initially formatted using exFAT. Then I tried wiping it off and format it with ext4. But then, Linux Mint 20 doesn't seem to be able to mount it. When I checked the "disks" utility, the USB appeared, but it just displayed the loading loop. I tried to cancel the mount job, no luck either. Then I tried a live Linux Mint 19, also can't open the USB, so this is clearly not a problem with my existing computer.
Then I booted up my Windows copy (dual boot with Mint 20), plugged the USB in, formatted it to exFAT, and Windows can then open it. Then I boot up Mint 20 and live Mint 19 and both can open it. So my question is, do USB manufacturers restrict the type of filesystems a USB can have? I have never heard of this phenomenon, and can you give me some source to read more?
...ANSWER
Answered 2020-Sep-16 at 23:58So I have dug into this a whole lot for the past few days and I think I know what's wrong. I tried to create an ext4 partition, didn't work. I then tried to fix it using fsck, also no dice. Then I tried to create an ext4 partition with less size (60GB), and then it works, with no corruption. It turns out that I just got scammed by the manufacturer.
QUESTION
I tried to do some write/read operations on filesystems that I have enumerated for. The problem is when I want to write to other volumes rather than my self (fs0), it will return WRITE PROTECTED
Error.
ANSWER
Answered 2020-Jul-27 at 18:59My educated guess is that you trying to access NTFS volume (since you talked about Windows partitions) and NTFS is not supported by UEFI (by default). At least, I haven't seen any firmware that does. UEFI supports FAT32 file systems only.
If you drop into UEFI shell on your platform you should see the "Mapping table" (see the sample picture below), if there is a device labeled "FS0". This indicates that the firmware detected the disk, discovered the partition, and was able to mount the file system. The rest of the volumes labeled as BLK, which means UEFI can give the access using BlockIO Protocol only. No FS Protocol support.
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