U
- UDF (Universal Disk Format), I/O System Components, Windows File System Formats, UDF
- UDFS (user defined file system), The BIOS Boot Sector and Bootmgr
- Udfs.sys (UDF driver), UDF, Local FSDs
- UEFI systems, MBR-Style Partitioning, GUID Partition Table Partitioning, Boot Process, The UEFI Boot Process, The UEFI Boot Process
- UI0Detect.exe (Interactive Services Detection service), Smss, Csrss, and Wininit
- UMDF (User-Mode Driver Framework), Types of Device Drivers, User-Mode Driver Framework (UMDF), User-Mode Driver Framework (UMDF), User-Mode Driver Framework (UMDF)
- Umpnpmgr.dll, Driver Installation
- underrun detection, Driver Verifier
- UNDI (Universal Network Device Interface), Booting from iSCSI
- undo entries, Log Record Types, Log Record Types
- undo pass, Logging Implementation, Log File Service, Undo Pass, Undo Pass, Undo Pass
- undo records, Logging Implementation
- undo/redo histories, Common Log File System
- undocking, Level of Plug and Play Support
- UNEXPECTED_KERNEL_MODE_TRAP stop code, Causes of Windows Crashes, 0x7F - UNEXPECTED_KERNEL_MODE_TRAP, 0xC5 - DRIVER_CORRUPTED_EXPOOL
- Unicode, CDFS, FAT12, FAT16, and FAT32, Unicode-Based Names, Unicode-Based Names, File Records, File Names–File Names, File Names, File Names
- unified caching (Store Manager), Unified Caching, Unified Caching, Unified Caching
- Unified Extensible Firmware Interface (UEFI), GUID Partition Table Partitioning, GUID Partition Table Partitioning, Boot Process, The UEFI Boot Process
- unique IDs (partition manager), Partition Manager
- Universal Disk Format (UDF), I/O System Components, CDFS, FAT12, FAT16, and FAT32
- Universal Network Device Interface (UNDI), Booting from iSCSI
- unkillable processes, I/O Cancellation, I/O Cancellation, I/O Cancellation for Thread Termination
- unknown page fault errors, Invalid PTEs
- unload routines, Structure of a Driver–Driver Objects and Device Objects, Structure of a Driver, Driver Objects and Device Objects
- unloading drivers, I/O System Components
- unmapped pages, Page Files
- unnamed data attributes, File Records, File Records
- unnamed file streams, Cache Working Set Size, Multiple Data Streams
- unparked cores, Thresholds and Policy Settings, Performance Check
- unpinning pages, Caching with the Mapping and Pinning Interfaces
- unsigned drivers, Driver Installation, Driver Installation, Using Crash Troubleshooting Tools, Hung or Unresponsive Systems
- untrusted locations, Multiple Data Streams
- unwinding, Kernel Stacks
- update records, Log Record Types, Log Record Types, Recovery, Redo Pass
- update sequence numbers (USNs), Change Logging, The Change Journal File, On-Disk Implementation
- updating, Solid State Disks, File Deletion and the Trim Command, Post–Splash Screen Crash or Hang, Verbose Analysis
- device drivers, Post–Splash Screen Crash or Hang
- flash memory, Solid State Disks
- kernel, Verbose Analysis
- sectors, File Deletion and the Trim Command
- upper-level filter drivers, Device Stacks, Device Stack Driver Loading
- uppercase characters, Master File Table
- uppercase file (, Master File Table
- uptime, listing, Advanced Crash Dump Analysis
- USB (universal serial bus), Types of Device Drivers, Bandwidth Reservation (Scheduled File I/O), KMDF Data Model, Volume Management, The BIOS Boot Sector and Bootmgr
- bandwidth reservation, Bandwidth Reservation (Scheduled File I/O)
- basic disks, Volume Management
- drivers, Types of Device Drivers
- KMDF objects, KMDF Data Model
- ports, The BIOS Boot Sector and Bootmgr
- USB debugger, The BIOS Boot Sector and Bootmgr, The BIOS Boot Sector and Bootmgr
- USB dongles, Hung or Unresponsive Systems
- USB flash devices, KMDF Data Model, User-Mode Driver Framework (UMDF), BitLocker Drive Encryption, Encryption Keys, BitLocker To Go, ReadyBoost, Unified Caching, Unified Caching
- BitLocker, Encryption Keys
- BitLocker To Go, BitLocker To Go
- KMDF objects, KMDF Data Model
- ReadyBoost, ReadyBoost, Unified Caching
- startup disks, BitLocker Drive Encryption
- stores, Unified Caching
- UMDF display, User-Mode Driver Framework (UMDF)
- USB keyboards, Hung or Unresponsive Systems
- use after free bugs, Buffer Overruns, Memory Corruption, and Special Pool
- usefirmwarepcisettings element, The BIOS Boot Sector and Bootmgr
- uselegacyapicmode element, The BIOS Boot Sector and Bootmgr
- usephysicaldestination element, The BIOS Boot Sector and Bootmgr
- useplatformclock element, The BIOS Boot Sector and Bootmgr
- user address space, Virtual Address Space Layouts–x86 Address Space Layouts, x86 Address Space Layouts, User Address Space Layout–User Address Space Layout, User Address Space Layout, User Address Space Layout, Controlling Security Mitigations
- layout overview, User Address Space Layout–User Address Space Layout, User Address Space Layout, User Address Space Layout
- security mitigations, Controlling Security Mitigations
- virtual address space layouts, Virtual Address Space Layouts–x86 Address Space Layouts, x86 Address Space Layouts
- user buffers, Thread Agnostic I/O
- user code address translation, IA64 Virtual Address Translation
- user data stream caching, Single, Centralized System Cache
- user defined file system (UDFS), The BIOS Boot Sector and Bootmgr
- user IDs, Quota Tracking–Consolidated Security, Quota Tracking, Consolidated Security
- User objects, Types of Heaps
- user process address space, The BIOS Boot Sector and Bootmgr
- user scripts, Smss, Csrss, and Wininit
- user space layouts, System Virtual Address Space Quotas–Controlling Security Mitigations, User Address Space Layout, Image Randomization, Heap Randomization, Controlling Security Mitigations, Address Translation
- user stacks, Stacks, User Stacks
- user-initiated I/O cancellation, User-Initiated I/O Cancellation–User-Initiated I/O Cancellation, User-Initiated I/O Cancellation, I/O Cancellation for Thread Termination
- user-mode accessible bit, Physical Address Extension (PAE)
- user-mode applications, Typical I/O Processing–Device Drivers, Device Drivers
- user-mode buffers, Opening Devices
- user-mode code, Page Tables and Page Table Entries
- user-mode debugging framework, Initializing the Kernel and Executive Subsystems, Initializing the Kernel and Executive Subsystems
- User-Mode Driver Framework (UMDF), Types of Device Drivers, User-Mode Driver Framework (UMDF), User-Mode Driver Framework (UMDF), User-Mode Driver Framework (UMDF), The Plug and Play (PnP) Manager
- user-mode drivers, Types of Device Drivers, User-Mode Driver Framework (UMDF), User-Mode Driver Framework (UMDF), User-Mode Driver Framework (UMDF), The Plug and Play (PnP) Manager
- user-mode exceptions, The BIOS Boot Sector and Bootmgr
- user-mode heaps, Heap Manager Structure
- user-mode page faults, Page Fault Handling
- user-mode pages, No Execute Page Protection
- user-mode processes, Memory Notification Events–Memory Notification Events, Memory Notification Events, Memory Notification Events
- user-mode stack, Reserving and Committing Pages–Reserving and Committing Pages, Reserving and Committing Pages, Reserving and Committing Pages
- user-mode virtual address space, x64 Virtual Addressing Limitations
- Userinit.exe, Smss, Csrss, and Wininit, Safe-Mode-Aware User Programs
- users, Scenarios
- fast-user switching, Scenarios
- Usndump.exe utility, The Change Journal File
- USN_REASON identifiers, The Change Journal File–The Change Journal File, The Change Journal File, The Change Journal File
- UTF-16 characters, Unicode-Based Names
- utility, processor, Utility Function, Utility Function, Utility Function, Utility Function, Thresholds and Policy Settings, Thresholds and Policy Settings, Performance Check, Performance Check, Performance Check
- Uuidgen utility, Driver Objects and Device Objects