Wren was the major brand name for a series of 5.25-inch hard disks produced by Control Data Corporation (CDC) for the microcomputer market during the 1980s.
The brand evolved through seven major versions, I through VII, using custom attachments but later adapting SCSI and IDE.
The Wren II was the first drive to use the ATA-IDE interface, and the first to use the 40 pin ATA connector, introduced on Compaq 386 systems at COMDEX in 1986.
[1] Wren was a major brand during the 1980s, especially in the high-end market where its 5,400 RPM voice-coil–based technology gave them a performance edge.
However, by the 1980s, CDC was in the middle of selling itself off leading to its eventual disappearance.