2.1 What ChorusOS Systems Support

This section reviews the file systems and related media supported for the ChorusOS 4.0 product. As stated in the note above, support for specific ChorusOS file systems and hardware devices depends on the target family.

2.1.1 Supported Media

The ChorusOS 4.0 product supports the following hardware, although not necessarily for all target platforms:

Flash memory

Flash device support is implemented using Flite 1.2. Flash support allows you to use only MS-DOS file systems on supported flash devices.

IDE hard disk drives

Supported hard disk drives must be connected to an IDE, ST506 or ESDI compatible disk controller.

RAM disk memory

RAM disk support allows you to create disk-like entities and use file systems in random-access memory.

SCSI hard disk drives

Selected SCSI hard disk drives and SCSI-PCI I/O processors of the NCR53C8xx family are supported.

ChorusOS 4.0 requires that you use special device driver files in order to read from and write to these devices. See "2.3 Required Special Device Driver Files" and special(7S) for details.

2.1.2 Supported File Systems

The ChorusOS 4.0 product supports the following file systems, although not necessarily for all target platforms:

Network File System (NFS)

NFS is the standard among UNIX operating systems for sharing file systems over the network. ChorusOS systems can support both NFS client access to shared file systems and NFS server capabilities to share local file systems with other systems on the network.

File Allocation Table (FAT) File System

Also known as the MS-DOS file system, this supports file allocation tables with 12, 16 or 32-bit entries, making it possible to support long file names.

UNIX File System (UFS)

Also known as the Fast File System, this supports long file names and links, and is the required type for file systems exported through NFS.

Swap File System

The ChorusOS 4.0 product also supports the use of a swap partition on supported local hardware devices.

The following table summarizes which file systems are supported for which media.

Table 2-1 File System Support By Media

	MS-DOS	UFS	Swap
Flash	X
IDE	X	X	X
RAM disk	X	X
SCSI	X	X	X