---
title: kSCSIProtocolNotification_VerifyDeviceState
framework: Kernel
role: symbol
role_heading: Enumeration Case
platforms: [macOS 10.12+]
path: kernel/1638595-anonymous/kscsiprotocolnotification_verifydevicestate
---

# kSCSIProtocolNotification_VerifyDeviceState

## Declaration

```occ
kSCSIProtocolNotification_VerifyDeviceState = 0x69000020
```

## Discussion

Discussion Private message sent between a SCSI protocol service provider and SCSI application layer driver to indicate device state may have changed and the device state should be re-verified by the SCSI Application Layer driver. An example would be a bus reset which clears the tray locking state of an ATAPI device.