Description
Data Storage and Retrieval
Data storage and retrieval is the process of storing data on a hard drive and accessing that data when needed. It involves several components and technologies that work together to ensure that data is stored securely and can be quickly accessed when needed.
The hard drive stores data in magnetic domains on spinning disks. Each disk is divided into a number of tracks, and each track is further divided into sectors. The data is written onto the disk using read/write heads that move across the disk as it spins. The read/write heads read data from the disk by detecting changes in the magnetic field, and write data to the disk by altering the magnetic field.
To retrieve data from the hard drive, the computer sends a request to the hard drive’s controller, which locates the data on the disk and reads it into memory. The data is then passed back to the computer, which can use it for various purposes.
To ensure that data is stored and retrieved accurately, hard drives use various error detection and correction techniques. These techniques include checksums, parity checking, and error-correcting codes (ECC). In addition, many hard drives also include built-in features for detecting and relocating bad sectors on the disk to prevent data loss.
In order to optimize data storage and retrieval, hard drives are typically organized into partitions, which are logical divisions of the disk that can be treated as separate storage volumes. Partitions can be formatted with different file systems, such as NTFS or FAT32, which determine how data is organized and accessed on the disk. Some hard drives also include caching and buffering mechanisms to speed up data access and retrieval.
Power Consumption and Management
Power consumption and management are important considerations when selecting a hard drive. Hard drives require a certain amount of power to operate, and excessive power consumption can result in higher operating costs, increased heat generation, and reduced reliability.
The power consumption of a hard drive is determined by several factors, including the rotational speed of the disks, the number of disks, and the read/write activity on the disk. Generally, hard drives with higher rotational speeds and more disks will consume more power than those with lower rotational speeds and fewer disks. Additionally, hard drives that are heavily used for read/write activity will consume more power than those that are idle.
To manage power consumption, hard drives include various features that allow them to reduce power usage when not in use. For example, many hard drives include power management modes that automatically put the drive into a low-power state when it is idle for a certain period of time. This can significantly reduce power consumption and heat generation.
Some hard drives also include advanced power management features that allow the drive to adjust its power consumption based on usage patterns. These features may include spin-down of the disks when they are not in use, or variable speed control that reduces the rotational speed of the disks when the drive is not being heavily used. These features can help to further reduce power consumption while maintaining optimal performance.
Encryption and Security Features
Encryption and security features are important considerations when selecting a hard drive. These features help to ensure that data stored on the hard drive is protected from unauthorized access and can be a critical component in maintaining data security and compliance.
Hard drives may include hardware-based encryption features that encrypt data as it is written to the drive, providing protection against unauthorized access in the event of theft or loss. The encryption process can be either automatic, where the drive encrypts all data as it is written, or user-configurable, where specific files or folders can be encrypted on a per-file basis. The encryption key can be managed through a variety of methods, including self-encrypting drives, where the key is generated and managed by the drive itself, or external key management systems that allow administrators to securely manage encryption keys across multiple drives.
Another important security feature in hard drives is secure erasure, which is the process of permanently deleting data from the drive. This is particularly important when retiring or repurposing hard drives, as residual data may be recoverable even after the drive has been reformatted. Secure erasure is typically performed using a variety of methods, including overwriting the data multiple times, degaussing the drive to erase the magnetic domains, or physically destroying the drive.
Hard drives may also include other security features, such as firmware-based protection against malicious attacks or built-in sensors that detect physical tampering. Some drives also include features for detecting and reporting unauthorized access attempts or other security breaches.
Product Features
- Manufacturer: Hewlett Packard Enterprise (HPE)
- MPN: EG0900FDJYR
- Option Part Number: 619291-B21
- Spare Part Number: 619463-001
- Assembly Number: 718159-001
- HPE GPN: 507129-018
- SmartBuy Number: 619291-S21
- SKU: EG0900FDJYR
Technical Information
- Capacity : 900 GB
- Form Factor: 2.5inch
- Spindle Speed : 10000 RPM
- Interface : Serial Attached Scsi (SAS)6-Gbits
- Single Track : 0.21 Ms
- Average : 3.57 Ms
- Full-stroke : 7.30 Ms
- Physical Configuration : Bytes/sector 512
- Logical Blocks : 1,758,174,768
Dimension and Weight
- Width : 2.8 Inch
- Depth : 3.9 Inch
- Height : 0.6 Inch
- Weight :0.50 Lbs
Compatibility
- Blade System Integrity Server Blades
- HP Integrity Bl860c I2 Server Series
- HP Integrity Bl870c I2 Server Series
- HP Integrity Bl890c I2 Server Series
- Blade System Proliant Server Blades
- HP Proliant Bl460c G7 Server Series
- HP Proliant Bl465c G7 Server Series
- HP Proliant Bl620c G7 Server Series
- HP Proliant Bl680c G7 Server Series
- HP Proliant Bl685c G7 Server Series
- Blade System Proliant Workstation Blades
- HP Proliant Ws460c G6 Workstation Series
- Blade System Storage Blades
- HP Sb40c Storage Blade
- Disk Enclosures
- HP 70 Modular Smart Array
- HP D2000 Disk Enclosures
- File Services For Sans
- HP X3000 G2 Network Storage Systems
- HP Proliant Dl Servers
- HP Proliant Dl120 G7 Server Series
- HP Proliant Dl160 G6 Server Series
- HP Proliant Dl165 G7 Server Series
- HP Proliant Dl180 G6 Server Series
- HP Proliant Dl320 G6 Server Series
- HP Proliant Dl360 G7 Server Series
- HP Proliant Dl370 G6 Server Series
- HP Proliant Dl380 G7 Server Series
- HP Proliant Dl580 G7 Server Series
- HP Proliant Dl585 G7 Server Series
- HP Proliant Dl980 G7 Server Series
- HP Proliant Ml Servers
- HP Proliant Ml110 G7 Server Series
- HP Proliant Ml350 G6 Server Series
- HP Proliant Ml370 G6 Server Series
