Free. Open Source. Linux ▼ Disk Imaging. Partition (number theory), a way to write a number as a sum of other numbers. Multiplicative partition, a way to write a number as a product of other numbers. Partition of an interval. Partition of a set. Partition of unity, a certain kind of set of functions on a topological space. Plane partition.
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History
Coriolis Systems was founded by Alastair Houghton back in 2004, who had left his job around a year earlier to write the company's first product, iPartition, after becoming annoyed that he couldn't repartition his new laptop to install developer versions of Mac OS X without wiping it clean.
He went on to develop iDefrag, in part to work around a limitation of the original version of iPartition, then hired Chris Suter, who was responsible for adding a number of features to the products (most notably, NTFS support, reboot-and-defragment mode in iDefrag and a new data movement algorithm for iPartition that was more efficient and enabled the unique recoverability feature in that product).
Alastair hired James Snook, and subsequently Ed Warrick and Mark Steadman, to help with the growing support load and to help maintain the software. James, Ed and Mark also worked on some internal projects and a couple of things that, sadly, have still to see the light of day.
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The team at Coriolis kept iDefrag and iPartition working across multiple major system updates, from 10.3 to 10.13, and across the PowerPC/Intel switchover (which was rather more work than just clicking a button and rebuilding); we worked around some nasty bugs in Mac OS X, and indeed in third-party hardware and device drivers; and all the while we tried hard to answer support queries promptly, professionally and courteously.
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Changes to the Mac, beginning with the adoption of SSDs, saw sales of the company's core products, iDefrag in particular, enter a slow decline. The final nails in the coffin were the decision of Apple to switch to its new filesystem, APFS, the volume format for which was totally undocumented until the week before macOS Mojave shipped, and the increasingly draconian security controls that made it harder for third-party utility software to function in a manner end users would find acceptable. In early 2019, Alastair finally took the decision to shut down the company he'd founded nearly 15 years previously.