High Performance File System

Windows NT 3.1 and 3.5 have native read/write support for local disks and can even be installed onto an HPFS partition.

Starting with Windows NT 4 the filesystem driver PINBALL.SYS enabling the read/write access is not shipped anymore.

Microsoft retained rights to OS/2 technologies, including the HPFS filesystem, after they ceased collaboration with IBM.

However, since HPFS lacks a journal, any recovery after an unexpected shutdown or other error state takes progressively longer as the filesystem grows.

A utility such as CHKDSK would need to scan each entry in the filesystem to ensure no errors are present, a problem which is vastly reduced on NTFS, which simply replays the journal.