I have a few questions about the USB stick used as an installer in Linux.

1) Should I leave extra space after running dd?

So for Windows user, you might be familiar with rufus, with rufus you can burn .iso file to USB sticks. For safety I personally prefer using dd method which is a common way we burn .iso file in Linux, and here's the question. Since I haven't used dd in Linux yet, I don't know how it results in Linux, but as I use rufus on Windows, it actually erase all and creates a new partition for dd, and which in my case (I'm using solus) is 30MB. Then with this result, I'm wondering, if I use dd to burn iso and it only uses 30MB, does it meant we can use a USB stick like 2GB or even small as 64MB to install the installer?

2) Will use USB 2 or USB 3 as installer makes any difference?

So we know the installer will install different types of Linux depending on the hardware or BIOS (for example legacy V.S. EFI). Then will use USB 2 or USB 3 as installer makes any difference? Except for the installation speed.

3) Can I reuse the installer?

Last question, if I used the installer for a installation process, can I use it in another installation for another disk? Or I should format and reburn a new one just in case something is damaged during the previous installation process?

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