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It completely depends on the use case. Since most of the latest machines come with >250 GB HDD space, I suggest the below recommendations assuming that you have enough space for other partitions. ( Since most of users will go for a separate /home partition, we don't have to consider about the documents and other files such as media files when creating / partition. ) It goes without saying that If you have a separate /home partition, you don't have to bother about backing up data before every installing a different distro. (But keep in mind that the config files of one distro may not be recognized properly by another distribution.)

  • If you intend to keep this installation for at least a few years and if you will be installing quite a few packages such as multimedia and office software, I recommend that you go for something more than 50 GB. After a fresh install, you may find that there is quite a space left in your root partition, but you will realize that these are being used up after a couple of months. After using it for two years and after two upgrades ( 21 to 22 and then to 23 ), my / partition has used up 32 GB. If one has to install a quite a few packages like LibreCAD and blender, I suggest to assign it a 50 GB so that you don't have to re size it after few new package installation and upgrades.

  • If your usage is most likely be limited to accessing internet and editing documents, I really do not see a requirement for allocating huge space for root partition. In such cases 10 or 12 GB of / partition can suffice. In my netbook (that I had) the / partition was 12 GB and it ran Fedora XFCE spin. I had libreoffice, gnuzilla, chromium, midori and (google-chrome) installed in that. I didn't have need for any other applications and even after a couple of applications, I had few GB space left.

  • If you are feeling adventurous and if you keep on re-installing the Operating system, then go for a 20 GB / partition. This could allow you to try installing few packages on that distro as if you go for the bare minimum requirement, you may run into issues if you try to install some heavy packages with high number of dependencies.

It completely depends on the use case. Since most of the latest machines come with >250 GB HDD space, I suggest the below recommendations assuming that you have enough space for other partitions. ( Since most of users will go for a separate /home partition, we don't have to consider about the documents and other files such as media files when creating / partition. ) It goes without saying that If you have a separate /home partition, you don't have to bother about backing up data before every installing a different distro. (But keep in mind that the config files of one distro may not be recognized properly by another distribution.)

  • If you intend to keep this installation for at least a few years and if you will be installing quite a few packages such as multimedia and office software, I recommend that you go for something more than 50 30 GB. After a fresh install, you may find that there is quite a space left in your root partition, but you will realize that these are being used up after a couple of months. After using it for two years and after two upgrades ( 21 to 22 and then to 23 ), my / partition has used up 32 24 GB. If one has to install a quite a few packages like LibreCAD and blender, I suggest to assign it a 50 30 GB so that you don't have to re size it after few new package installation and upgrades.

  • If your usage is most likely be limited to accessing internet and editing documents, I really do not see a requirement for allocating huge space for root partition. In such cases 10 or 12 GB of / partition can suffice. In my netbook (that I had) the / partition was 12 GB and it ran Fedora XFCE spin. I had libreoffice, gnuzilla, chromium, midori and (google-chrome) installed in that. I didn't have need for any other applications and even after a couple of applications, I had few GB space left.

  • If you are feeling adventurous and if you keep on re-installing the Operating system, then go for a 20 GB / partition. This could allow you to try installing few packages on that distro as if you go for the bare minimum requirement, you may run into issues if you try to install some heavy packages with high number of dependencies.

It completely depends on the use case. Since most of the latest machines come with >250 GB HDD space, I suggest the below recommendations assuming that you have enough space for other partitions. ( Since most of users will go for a separate /home partition, we don't have to consider about the documents and other files such as media files when creating / partition. )

It goes without saying that If you have a separate /home partition, you don't have to bother about backing up data before every installing a different distro. (But keep in mind that the config files of one distro may not be recognized properly by another distribution.)distribution.) ( Edit: Though /home partition can be preserved between installs, it is always recommended to take a back up. )

  • If you intend to keep this installation for at least a few years and if you will be installing quite a few packages such as multimedia and office software, I recommend that you go for something more than 30 GB. After a fresh install, you may find that there is quite a space left in your root partition, but you will realize that these are being used up after a couple of months. After using it for two years and after two upgrades ( 21 to 22 and then to 23 ), my / partition has used up 24 GB. If one has to install a quite a few packages like LibreCAD and blender, I suggest to assign it a 30 GB so that you don't have to re size it after few new package installation and upgrades.

  • If your usage is most likely be limited to accessing internet and editing documents, I really do not see a requirement for allocating huge space for root partition. In such cases 10 or 12 GB of / partition can suffice. In my netbook (that I had) the / partition was 12 GB and it ran Fedora XFCE spin. I had libreoffice, gnuzilla, chromium, midori and (google-chrome) installed in that. I didn't have need for any other applications and even after a couple of applications, I had few GB space left.

  • If you are feeling adventurous and if you keep on re-installing the Operating system, then go for a 20 GB / partition. This could allow you to try installing few packages on that distro as if you go for the bare minimum requirement, you may run into issues if you try to install some heavy packages with high number of dependencies.