---
title: SCSIDeviceIdentifier
framework: IOKit
role: symbol
role_heading: Type Alias
platforms: [Mac Catalyst 13.0+, macOS 10.2+]
path: iokit/scsideviceidentifier
---

# SCSIDeviceIdentifier

64-bit number to represent a SCSI Device.

## Declaration

```occ
typedef UInt64 SCSIDeviceIdentifier;
```

## Discussion

Discussion If the identifier can either be that of an initiator or a target, SCSIDeviceIdentifier should be used.