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Detailed information about ATA disk drives, HDD temperature, HDD health status, transfer modes and HDD features.


HDD Model: HDD vendor and model read from IDE-controller.

HDD Default Size: Real HDD size read from the IDE-controller. Due to the two different ways of defining 'megabyte' your hard disk capacity can be calculated in two different ways: after calculating the number of bytes in the formula heads*sectors*cylinder*512-bytes-per-sector you may get the result in the unit 'megabyte' by dividing either by 1024*1024 (like in the BIOS of the computer does) or by 1000*1000 (like the producers of hard disks do).

Interface Type: ATA device interface type (Parallel ATA, Serial ATA I, Serial ATA II, Serial ATA III)

Geometry: Logical number of heads, sectors per track and tracks while CHS addressing. It has nothing to do with physical HDD parameters.

Compatibility: Compatibility of this device with the specific ATA/ATAPI standard.

Serial Number: HDD unique serial number.

Controller Revision: Number of the revision returned by the IDE-controller.

HDD Marketing Size: The marketing size much more than real size. In one 'computer' megabyte of 1048576 bytes, but in one 'marketing' (used by HDD manufacturers) of 1000000 bytes.

Buffer Size: Buffer size of the IDE-controller (you shouldn't mix it up with disk cache). Part of the buffer can be used for system
purposes, and its real size can be smaller. Some hard disks don't provide information on the buffer size.

Buffer Type: Internal buffer type of the IDE-controller. Possible values - 'Not specified', 'Single ported single sector buffer', 'Dual ported multi-sector buffer', 'Dual ported multi-sector buffer with a read caching'.

HDD Temperature: Current temperature of HDD.

Reallocated Sectors: Number of reallocated sectors.

HDD Health Status: Can be one of four values:

  • Good - HDD is healthy;
  • Overheating - HDD overheating;
  • Poor - HDD health is average. It does not mean that the disk is faulty, however run a HDD diagnostic utility provided by your HDD vendor;
  • Bad - HDD health is bad. The risk of HDD failure is extremely high, do data backup immediately and run a HDD diagnostic utility provided by your HDD vendor.

Host Writes: Total size of data written to SSD disk by the host system.

Host Reads: Total size of data read from SSD disk by the host system.

ECC bytes: Number of correction bytes.

Security Erase Time: Security Erase Time (in minutes).

Enh. Security Erase: Enhanced Security Erase (in minutes).

Current APM Value: Current Advanced Power Management Value.

Acoustic Management: Current value of the automatic acoustic management (recommended - value recommended by vendor) and status (enabled/disabled).

ATA Controller Vendor: Vendor of ATA controller

ATA Controller Name: Name of ATA controller

Device Location: Device location on the ATA controller

Transfer Modes

PIO Mode Support: PIO (Programmed Input/Output) is a way of moving data between device in a computer in which all data must pass through the processor. The higher the number is, the higher the data transfer rate is (For PIO mode 4 - 16.6 MBps).

SW DMA Mode Support: Number of the supported single word DMA mode. Active: SW DMA mode currently enabled by BIOS.

MW DMA Mode Support: DMA (Direct Memory Access) is a transfer protocol where a peripheral device transfers information directly to or from memory, without the system processor being required to perform the transaction. Apart from the previous mode, single word DMA modes can be supplanted by multiword DMA modes. Active: MW DMA mode currently enabled by BIOS.

UDMA Mode Support: Number of the UltraDMA mode. Theoretical transmission speed for UltraDMA mode 2 is 33 MB/s, mode 5 - 100 MB/s. Some chipsets don't support UltraDMA mode (for example, chipsets i430VX and lower don't support it while i440BX supports only mode 2). Active: UltraDMA mode currently enabled by BIOS.

Sectors per Interrupt: Number of sectors that can be transferred per interrupt in a block mode. Active: Current numbers of sectors per interrupt.

HDD Features

  • SATA NCQ Command
  • DMA Transfer: HDD support of the DMA mode
  • LBA Supported: LBA (Logical Block Addressing) - accesses made through "big" logical blocks of data. Intended to break 504 MB barrier so that BIOS can support disks larger than 1024 cylinders
  • Block Mode: HDD block mode. This means that more than one sector can be transferred on each interrupt; newer drives allow you to transfer as many as 16 or 32 sectors at a time
  • Double Word I/O: Support of DMA mode with two data words
  • Standard Standby Timer
  • IORDY Supported
  • IORDY may be Disabled
  • S.M.A.R.T. (Self-Monitoring, Analysis, Reporting Technology): An open standard for developing disk drives and software systems that automatically monitor a disk drive's health and report potential problems so that you to take proactive actions to prevent impending disk crashes
  • S.M.A.R.T. Self-test
  • S.M.A.R.T. Error Logging
  • Security Mode
  • Removable Media
  • Power Management
  • PACKET Command
  • Write Cache
  • Look-ahead
  • Release Interrupt
  • Service Interrupt
  • Device Reset Command
  • Host Protected Area
  • Write Verify Command
  • Write Buffer Command
  • Read Buffer Command
  • NOP Command
  • Identify Device DMA Command
  • Download Microcode Command
  • Read/Write DMA Queued
  • CFA Feature
  • Advanced Power Management
  • Removable Media Status
  • Power-up in Standby
  • Set Features Req. to Spinup
  • Set Max Security Extension
  • Automatic Acoustic Management: Optimizing the noise-to-speed ratio of your hard disk
  • 48-bit Address: Support of the 48-bit LBA address
  • Device Configuration Overlay
  • Flush Cache Command
  • Flush Cache Ext Command
  • Media Serial Number
  • Media Card Pass Through
  • Streaming Feature
  • General Purpose Logging
  • Write DMA/Multiple FUA EXT
  • Write DMA Queued FUA EXT
  • World Wide Name

Starting from S.M.A.R.T., every item can be enabled or disabled.


See Driver page for more details.

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