Alcatel-Lucent UN375F SP3QADRAAC 3B21D Disk Drive is a 3.5-inch hard disk drive module designed for the UN375F circuit packs used in the 5ESS switch family. The drive is a SCSI-based 3.5-inch HDD associated with the UN375F 3B21D disk-drive family, and the SP3QADRAAC variant identifies this specific unit within that lineup. It is commonly cataloged as a replacement part for UN375F disk drives in telecommunications equipment, with vendors listing it under UN375F SP3QADRAAC 3B21D DISK DRIVE for ADM-16/1 configurations in the 5ESS system.
