I agree with TBone. Just have to be sure you do know exactly how to attach it and it should be able to mount either in linux if not a live bsd or maybe even solaris. One of them ought to read it.
From wiki and we only assume jfs or jfs1
In the Linux operating system, JFS is supported with the kernel module (since the kernel version 2.4.18pre9-ac4) and the complementary userspace utilities packaged under the name JFSutils (the latest version 1.1.14 released in April, 2009). Most Linux distributions provide support for JFS, unless it is specifically removed due to space restrictions or other concerns.
According to reviews and benchmarks of the available filesystems for Linux, JFS is fast and reliable, with consistently good performance under different kinds of load, contrary to other filesystems that seem to perform better under particular usage patterns, for instance with small or large files. Another characteristic often mentioned, is that it's light and efficient with available system resources and even heavy disk activity is realized with low CPU usage."