Hello.

I have used FDM for an long time and in moment using 6.22.
I see FDM 6.22 not does pre allocate total file size for big download files as does the previous versions. That is wrong and create fragmentation.
OS is Linux Ubuntu 20.04 using an an disk partition BTRFS in an HDD.
Here happening an bizarre problem ...
I have selected to download an file of more than 14 GB not being torrent.
The download has started, but happen an high disk activity in partition used by FDM to dowload that file 14 GB.
That high disk activity not stop and in status show 3 hours and 40 minutes to complete download so being more than 3 hours not stop disk activity !
Not pre allocating total file size in BTRFS partitions does problems.
When press the pause button in that download file the disk activity stop and restart when press to continue downloading.

Why pre allocate total file size feature was removed ? are happening bug ?
Please consider to allow pre allotcate total file size in next version.

Any devs can reply ?
Thanks for reading my topic.

Hello,
I failed to google if your BTRFS supports sparse files.
But it seems it does not.
In that case a high disk usage is OK.

@Alex
Thanks for your reply.

I use BTRFS for partition used by FDM for more than 2 years and FDM previous version had pre allocated disk size for any type of download file.
BTRFS supports sparse files.

I remember downloading similar files in FDM previous versions being possible pre allocate disk space and not high disk activity.

Any chance for an fix in Linux version ?

Hello,
Can you please tell me:
1. What is the last version of FDM which did work for you without this issue?
2. Is this issue reproducible on regular downloads or torrents or both?

Thanks for your reply.

1. What is the last version of FDM which did work for you without this issue?
I not remember exactly what is the version. Possibly 6.20.0.5510 (12-2023) because i see that bug in 2024 builds.
Previous versions pre allocate disk space without high disk usage in BTRFS.

2. Is this issue reproducible on regular downloads or torrents or both?
Both.

Here reference to sparse files in BTRFS.
https://btrfs.readthedocs.io/en/latest/ ... m-features
no-holes section

Hello,
Please install it again and check if it has this issue.
https://files2.freedownloadmanager.org/ ... 0.5510.deb

Thanks for your actions replying.
Tested the file from link
https://files2.freedownloadmanager.org/ ... 0.5510.deb

Unhappily not allocating disk space using sparse file =(

That's an issue in Ubuntu 24.04 ?
Please anyone still using Ubuntu 20.04 and 22.04 maybe test FDM if allocate disk space using sparse files in both ext and btrfs ?

I have tested FDM in Ubuntu 20.04 kernel 6.5 in an BTRFS partition and not allocate disk space creating sparse file download being the same issue as Ubuntu 24.04.
Starting FDM being user or sudo happen the same issue.
However if trying save allocate download file in another file system is created the download file with sparse file size allocation.

Happen that issue in BTRFS partitions.
If using terminal and the command below is created an sparse file with 512 MB in BTRFS. Perhaps not is an issue in BTRFS file system and FDM need change internally any command when creating file downloads in BTRFS ?

dd if=/dev/zero of=sparse_file bs=1 count=0 seek=512M

Hello,
Please install this version. I hope it should work fine for you. Please tell me about the result.

Excuse me for the long time for reply ... here internet access problems =(
Tested with the build above now the sparse file allocation works !
Need more tests.
Thanks Alex and have an nice week.