The Nokia N900 has 32 GB eMMC and 256 MB NAND non-removable storage

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Storage

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The Nokia N900 has 32 GB eMMC and 256 MB NAND non-removable storage.[2] Additional storage is available via a hot swappable microSDHC card socket, which is certified to support up to 16 GB of additional storage.[73] Hot swapping works based on a magnetic sensor which detects removal of the back cover, which causes the partition to be unmounted. The microSDHC card can be formatted with a supported file system such as ext2, ext3, FAT16 and FAT32.[citation needed]

The 32 GB eMMC is split into 3 partitions:[35]

2 GB as ext3 mounted to /home

768 MB as swap

the remainder as VFAT mounted to /home/user/MyDocs with about 27 GB of free space.

The 256 MB NAND is formatted as UBIFS[74] and contains the bootloader, kernel and root directory "/"[citation needed] with about 100 MB of free space.

Programs larger than 500 kB including dependencies should be stored in /opt  which is symlinked to /home/opt and therefore located on the 2 GB ext3 partition. The VFAT partition is also available for storage but needs to be used carefully as it is unmounted and exported if a usb cable is connected to the device.