Create Partition For Ext3 Filesystem For Usb Mac

Ventoy Disk Layout In GPT

The answer depends on you willingness to invest in commercial software: If you don’t mind spending some money on a commercial product, Paragon’s extFS for Mac will give you read and write access to ext2 / ext3 / ext4 file systems. The current version supports all.
Any non-volatile storage device like hard disk, usb etc has a filesystem in place, on top of which data is stored. While installing Linux, you may opt for either EXT4 or EXT3 file system. A journaling filesystem: logs changes in a journal to increase reliability in case of power failure or system crash.
Format USB drive for both Mac and PC use. I bet some of you have this dilemma: you have a USB drive and want to use it on both Mac and PC. If you format the USB drive to HFS+ File System, it will not be supported by Windows computer. And if you format it to NTFS, it will not be fully supported in Mac Operating System.

Since Ventoy-1.0.15, you can install Ventoy with GPT partition style. (Windows: Option--->Partition Style, Linux: -g option)
Bellow is a 32GB USB drive's layout after install Ventoy in it. You can see that the whole disk was divided into 2 partitions in GPT format.

Ext3 was introduced by Stephen Tweedie. Some noteworthy points about ext3 filesystem are as follows. Max file size: 16 GB to 2 TB. Max file system size: 2 TB to 32 TB. One more interesting fact is that if you want journalling mechanism to be in your ext2 filesystem then you can easily convert it to ext3. Now lets understand how to create ext3.

About Part1

By default, Ventoy select exFAT filesystem for the main partition to hold iso files. exFAT has better compatibility on Windows/Linux/Mac and exFAT is suitable for USB stick.
You can reformat the 1st partition with other filesystem, now exFAT/FAT32/NTFS/UDF/XFS/Ext2/Ext3/Ext4 are supported.
It should be noted that, if you choose XFS/Ext2/Ext3/Ext4, the USB will be unavaliable on Windows and can not be used to install Windows.But if you only use Linux that will be a good choice, because XFS/Ext2/Ext3/Ext4 will have better performance in Linux.

About Part2

There must be an EFI System Partition with FAT filesystem and that's the mandatory requirements of UEFI specifications.So this partition is created to hold EFI boot file and other files nesscessy to Ventoy. These files are very small, so 32MB is enough. Besides, the EFI partition can be at part1 also, but I set it at part2 just because that in some version of Windows like Windows 7, only the first partition of the USB drive is visable to the system.And that's good for Ventoy's protection.
This partition is very small and used by ventoy, so you better not change anything in this partition.

About First 1MB Space

As for GPT format, there is a protect MBR in the 1st sector (LBA0), and then from LBA1 ~ LBA33 is the GPT partition head and partition table.LBA34 ~ LBA2047 is used to store legacy bios bootloader of Ventoy (same with MBR format).

Reserved Disk Space

You can preserve some space at the bottom of the disk. This is a 32GB USB drive's layout after install Ventoy in it (with 2GB reserved space).

When install Ventoy, you can enable and set the reserved space with 'Option' ---> 'Partition Configuration' (Windows) or '-r' option (Linux). The reserved space configuration is only for installation process.