Computer Memory and Storage

Hibernate mode saves the complete system state (RAM contents) to the hard drive before powering down completely. Unlike Standby or Suspend modes which keep data in RAM and require continuous power, Hibernate allows you to fully power off and later resume exactly where you left off.

FDISK is the DOS utility used for creating, deleting, and managing disk partitions. FORMAT prepares existing partitions for use but cannot create or delete them, DISKPART is a more modern Windows command-line tool, and DEBUG is a low-level assembly debugger. FDISK is the classic partition management tool.

PST stands for Personal Storage Table, which is the file format used by Microsoft Outlook to store email messages, calendar items, and other data locally on your computer. It's the standard file extension for Outlook data files (.pst).

Adding more RAM has traditionally been the most effective way to improve Windows performance. While CPU upgrades help, Windows is memory-intensive and RAM directly reduces disk paging. Defragmenting and NTFS conversion are maintenance tasks, not performance upgrades. This holds true for Vista as well.

diskpart is the correct Windows command-line disk partition management utility. Option A is close but not the actual command, C incorrectly uses Microsoft Management Console (.msc) syntax which doesn't apply here, and D incorrectly uses Control Panel (.cpl) extension. The diskpart command is used for partition operations.

DMA stands for Direct Memory Access. It is a feature of computer systems that allows certain hardware subsystems to access main system memory independently of the central processing unit (CPU).

A page is the fundamental unit of data storage and transfer between disk and main memory in database systems. When data is retrieved, entire pages (typically 4KB-8KB) are moved to buffers, not individual records.

Option A correctly uses the new operator to allocate a character array: char *a = new char[20]; allocates 20 chars and stores the pointer in a. Options B and C are wrong because they assign a pointer to a non-pointer char variable.

VSAM (Virtual Storage Access Method) has four types: KSDS (Key Sequenced Data Set), ESDS (Entry Sequenced Data Set), RRDS (Relative Record Data Set), and LDS (Linear Data Set). RSDS is not a valid VSAM type - this is likely a confusion with RRDS. The question asks which is NOT a type, making RSDS the correct answer.

RAID level 1 is mirroring, which duplicates data across two or more disks. RAID 0 is striping (no redundancy), RAID 2 is rarely used (bit-level striping with Hamming ECC), and RAID 5 is striping with distributed parity. Mirroring specifically refers to RAID 1's exact data duplication technique.

The ipcs (inter-process communication status) command displays information about System V inter-process communication facilities, including shared memory segments, message queues, and semaphores. It is the standard Unix/Linux utility for this purpose. Options A, B, and D are misspellings or invalid commands.

RAID 1 is the mirroring level where data is written identically to two or more disks, providing redundancy. If one disk fails, the other contains an exact copy. RAID 2 uses bit-level striping with Hamming codes, RAID 3 uses byte-level striping with dedicated parity, and RAID 5 uses block-level striping with distributed parity.

RAID 5 requires a minimum of 3 disks because it uses block-level striping with distributed parity. With 2 disks, you cannot have both data stripes and parity distributed across them - that would require RAID 1 (mirroring) instead.

A RAID array can exist in several operational states. 'Online' means the array is healthy and fully functional. 'Degraded' indicates a drive has failed but data is still accessible via parity or mirroring. 'Rebuilding' occurs when a replaced drive is being reconstructed. Thus, all of these are valid RAID states.

CIFS (Common Internet File System) is the standard file system protocol used in NAS for file sharing, especially with Windows clients. It runs over TCP/IP and allows network-attached storage to share files as if they were local.