The shrouded padlock

Bolt cutters need a gap to bite into. The disc lock declines to provide one: its body is a squat steel drum, roughly the diameter of a fist, with a slot cut into the rim just wide enough to admit a hasp and a rotating bolt that closes flush against the housing once the shackle equivalent is seated. Where an ordinary padlock offers a shackle up to whoever wants it, the disc lock presents a curved shoulder of hardened steel, and most attempts to defeat it involve grinding rather than cutting, which takes considerably longer and draws considerably more attention in a corridor with a working camera. The front desk sells them for a flat fee, the same lock in the same box regardless of unit size, on the theory that the tenant with the smallest unit deserves the same resistance to theft as the tenant with the largest. Two keys come with each one, stamped with a serial number that means nothing without the receipt. The lock rusts eventually at the seam between drum halves, a fine orange line visible only up close, though the key still turns through it. Most units carry one. A few carry two, stacked on the same hasp, and what the second lock stops that the first one does not remains, as far as anyone at the front desk can say, an open question.

Marion Vale