Windows 7 / Getting Started

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Stop 0x7A or KERNEL_DATA_INPA GE_ERROR

The Stop 0x7A message indicates that a page of kernel data was not found in the paging (virtual memory) file and could not be read into memory. This might be due to incompatible disk or controller drivers, firmware, or hardware.

Interpreting the Message

This Stop message has four parameters:

1. Lock type value (0x01, 0x02, 0x03, or PTE address).
2. I/O status code.
3. If the lock type is 0x01, this parameter represents the current process; if the lock type is 0x03, this parameter represents the virtual address.
4. The virtual address that could not be read into memory.

Frequently, the cause of this error can be determined from the second parameter, the I/O status code. Some common status codes are the following:

• 0xC000009A, or STATUS_INSUFFICIENT_RESOURCES, indicates a lack of nonpaged pool resources.
• 0xC000009C, or STATUS_DEVICE_DATA_ERROR, indicates bad blocks (sectors) on the hard disk.
• 0xC000009D, or STATUS_DEVICE_NOT_CONNECTED, indicates defective or loose data or power cables, a problem with SCSI termination, or improper controller or disk configuration.
• 0xC000016A, or STATUS_DISK_OPERATION_FAILED, indicates bad blocks (sectors) on the hard disk.
• 0xC0000185, or STATUS_IO_DEVICE_ERROR, indicates improper termination, defective storage controller hardware, defective disk cabling, or two devices attempting to use the same resources.

Resolving the Problem

The following suggestions are specific to Stop 0x7A errors. For additional troubleshooting suggestions that apply to all Stop errors, see the section titled "Stop Message Checklist" later in this tutorial.

• Stop 0x7A can be caused by bad sectors in the virtual memory paging file, disk controller error, virus infection, or memory hardware problems. In extremely rare cases, depleted nonpaged pool resources can cause this error. If the first and third parameters are zero, the stack signature in the kernel stack is missing, an error typically caused by defective hardware. If the I/O status is 0xC0000185 and the paging file is on a SCSI disk, check for cabling and termination issues. An I/O status code of 0xC000009C or 0xC000016A indicates that the requested data could not be found. You can try to correct this by restarting the computer. If a problem with disk integrity exists, Autochk-a program that attempts to mark bad disk sectors as defective so that they are not used in the future-starts automatically. If Autochk fails to run, you can manually perform the integrity check yourself by following the instructions to run ChkDsk provided in the section titled "Stop 0x24 or NTFS_FILE_SYSTEM" earlier in this tutorial.
• Another cause of Stop 0x7A messages is defective, malfunctioning, or failed memory hardware, such as memory modules, L2 SRAM cache, or video adapter RAM. If you added new hardware recently, remove and replace the hardware to determine whether it is causing or contributing to the problem. Run Windows Memory Diagnostics to determine whether the feature has failed.
• Check the hardware manufacturer's Web site for updates to disk adapter firmware or drivers that improve compatibility. Verify that your disks and controller support the same set of advanced features, such as higher transfer rates. If necessary, select a slower transfer rate if an update is not yet available. Consult your hardware or device documentation for more information.
• The problem might also be due to cracks, scratched traces, or defective features on the motherboard. If all else fails, take the system motherboard to a repair facility for diagnostic testing.
• Problems that cause Stop 0x7A messages can also cause Stop 0x77 messages. For more information about Stop 0x77 messages, see the section titled "Stop 0x77 or KERNEL_STACK_INPAGE_ERROR" earlier in this tutorial.