Computer Memory and Storage

Pass-through disks provide highest performance by giving the VM direct access to physical storage without the VHD format overhead. Fixed VHDs add a virtualization layer, while dynamic VHDs can suffer from fragmentation.

The VHD format used by Hyper-V 2008 R2 has a 2TB maximum due to 32-bit sector addressing. Newer VHDX format supports larger disks but wasn't available in 2008 R2.

For Hyper-V storage monitoring, you should track Physical Disk % Disk Read Time, % Disk Write Time, and % Idle Time counters. All three metrics (D) provide comprehensive visibility into storage performance and bottlenecks.

In NetBackup, the primary backup types are Full backup, Differential Incremental backup, and Cumulative Incremental backup. These represent the fundamental backup methodologies that determine how much data is backed up each time. User-directed backups and archives are also valid backup operations in NetBackup. Therefore all listed options represent legitimate backup types or categories.

NetBackup consists of four main components: Master server (manages backups), EMM server (Enterprise Media Manager, manages media and devices), media server (writes data to storage), and client server (the machine being backed up). Option B is missing EMM. Option C incorrectly includes 'recovery' as a component. Option D would be incorrect because A is the complete, accurate list.

A basic disk can contain either 4 primary partitions OR 3 primary partitions plus 1 extended partition. The extended partition can then contain multiple logical drives. Both options A and C correctly describe valid basic disk configurations.

NTFS (New Technology File System) is more secure than FAT file systems because it supports Access Control Lists (ACLs) for fine-grained permissions, file encryption (EFS), disk quotas, file compression, and transactional operations. FAT-12/16/32 have no security features.

Virtual memory minimum size is typically set as a multiple of the initial size, not RAM size. Windows convention sets minimum virtual memory size to 2 times the initial size. This allows room for growth while preventing frequent resizing.

Disk quotas are a feature of NTFS, not FAT-32. FAT-32 file systems do not support quota management. Quotas allow administrators to track and control disk space usage per user.

ROM (Read-Only Memory) is permanent memory built into computers because it retains data without power and cannot be easily modified. RAM is volatile temporary memory that loses data when power is off, CPU is the processor, and CD-ROM is removable media. The 'permanent' and 'built into your computer' descriptions point directly to ROM chips containing firmware.

Standard CDs store approximately 650MB of data, though newer capacities reach 700MB. 1.4MB is floppy disk capacity, 10MB is unrealistically low for optical media, and 150MB doesn't match standard CD specifications. The 650MB figure is the widely accepted standard capacity for traditional compact discs.

The correct answer is A because BlackBerry application storage refers to the persistent flash memory and on-board memory where applications and data are stored. Option B ('Storage memory') is too vague. Option C ('Main memory') typically refers to RAM, which is volatile. Option D ('Partition storage') is not the standard terminology used in BlackBerry documentation.

Objective-C traditionally uses reference counting (manual memory management through retain/release/autorelease). While some versions of Objective-C on Mac OS X offered optional garbage collection, it was never available on iOS and has been deprecated. Reference counting (now largely automated through ARC) is the primary technique.

DDR stands for Double Data Rate, referring to how the memory transfers data on both the rising and falling edges of the clock signal, effectively doubling the data transfer rate compared to single data rate (SDR) memory. It is not related to 'Digital', 'Differential', or 'Dynamic' in this context.

SAN LUNs (Logical Unit Numbers) function as logical drives presented to servers, can be shared across multiple servers for clustering or load balancing, and represent soft partitions (logical subdivisions) of physical storage. Hard partitions refer to physical separation, not LUN functionality.