A Statistics-Based Data Placement Strategy for Hybrid Storage

Although hard disk drives have been popular over several decades, there still exists the deficiency because of their slow speeds and high power consumptions. By contrast, flash-based solid state disks exhibit good performance and low power consumption. However, the limited lifetimes become a fatal flaw of solid state disks. In order to take full advantage of hard disk drives and solid state disks, we design a hybrid storage system to make them work in a complementary manner. Further, we propose a data placement scheme for this system to determine the data placement on the underlying solid state disks or hard disk drives based on the data access statistics. Experiment results show that the lifetime of solid state disks and the response time of the system can be significantly improved compared with the alone storage media.

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Experimental Investigation of Frozen Solid State Drive on Digital Evidence with Static Forensic Methods

Lontar Komputer Jurnal Ilmiah Teknologi Informasi ◽

10.24843/lkjiti.2018.v09.i03.p06 ◽

2018 ◽

pp. 169

Author(s):

Imam Riadi ◽

Rusydi Umar ◽

Imam Mahfudl Nasrulloh

Keyword(s):

Solid State ◽

Computer System ◽

Rapid Development ◽

Hard Disk ◽

Data Access ◽

Solid State Drive ◽

Disk Storage ◽

Digital Forensic ◽

Storage Media ◽

Media Storage

The rapid development of computer technology in hardware, is currently developing non-volatile computer storage media Solid State Drive (SSD). SSD technology has a faster data access speed than Hard Disk and is currently starting to replace Hard Disk storage media. Freezing software on computer systems is often carried out by computer technicians, because it can save a computer maintenance costs due to errors, be exposed to computer viruses or malware. This software is used to prevent unwanted changes to the computer system, when the computer is restarted changes that occur in the computer system will not be stored on storage media. When this happens, what should be done by digital forensic investigators. This study discusses experimental forensic investigations on SSD media storage with frozen conditions or in this study said the frozen SSD. Frozen SSD is the condition of the drive that is locked so that there is no change in the computer system. Software used to lock and prevent changes such as Deep Freeze, Shadow Defender, Windows Steady State, and Toolwiz Time Freeze. Forensic research stages using methods NIST. The result shows that from comparative analysis conducted with Deep Freeze the results of the RecoverMyFile gives 76.38% and Autopsy gives 75,27%, while frozen condition with Shadow Defender the results of the RecoverMyFile gives 59.72% and Autopsy gives 74.44%. So the results of this study indicate the drive freezing software has an effect obtained can be an obstacle in the digital forensic process.

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Dynamics and control performance of hard disk drives with passive dampers

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/0954406042690452 ◽

2004 ◽

Vol 218 (12) ◽

pp. 1555-1568 ◽

Cited By ~ 1

Author(s):

L M Xu ◽

N Guo ◽

S Zeng ◽

R M Lin ◽

H Du

Keyword(s):

Dynamic Characteristics ◽

Transfer Functions ◽

Hard Disk Drives ◽

Hard Disk ◽

Data Access ◽

Open Loop ◽

Structure Design ◽

Disk Drives ◽

Phase Loss ◽

Dynamics And Control

The residual vibration is one of the primary mechanical problems that affect the dynamic characteristics of the head actuator assembly in hard disk drives, and the data access speed and positioning resolution. A discrete damping device has been developed to suppress the quasi-rigid-body mode and a reduction of 10 dB in amplitude is shown possible. The servo performance of the head actuator assembly with and without the damping device is presented in this paper, together with the measurement and prediction of the dynamic characteristics. Both closed- and open-loop transfer functions of the plant are measured in the actual operating environment on a servo test stand and compared with the simulation. It is found that the use of passive damping in the structure design allows for a greater margin of error at the crossover frequency since less phase loss results when notch filters are used, thus improving the stability robustness in feedback control.

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Data recovery in the case of fire-damaged Hard Disk Drives and Solid-State Drives

Forensic Science International: Reports ◽

10.1016/j.fsir.2021.100199 ◽

2021 ◽

pp. 100199

Author(s):

Denis Solodov ◽

Ilia Solodov

Keyword(s):

Solid State ◽

Hard Disk Drives ◽

Hard Disk ◽

Data Recovery ◽

Disk Drives ◽

Solid State Drives

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HAMR HDD Shock Responses

ASME 2013 Conference on Information Storage and Processing Systems ◽

10.1115/isps2013-2896 ◽

2013 ◽

Cited By ~ 1

Author(s):

Lidu Huang ◽

Kenzi Suzuki ◽

Fu-Ying Huang ◽

Toshiki Hirano ◽

Barry Stipe

Keyword(s):

Solid State ◽

Laser Diode ◽

Magnetic Recording ◽

Hard Disk Drives ◽

Hard Disk ◽

Cost Advantage ◽

Disk Drives ◽

Solid State Drive ◽

Lift Off ◽

Operational Shock

Heat assisted magnetic recording (HAMR) and slim mobile hard disk drives (HDD) are being developed parallelly to maintain cost advantage over the solid state drive (SSD). Operational shock and non-operational shock capabilities are seriously challenged for the slim HDDs due to reduced stiffness (thickness). It is worse for slim HAMR drives due to additional laser diode (LD) and other necessities being added on slider. Shock tests are part of the key performance matrices that must be passed in HDD reliability tests, and the concerns for HAMR mobile drives are, 1) slider lift-off G-level degradation during op-shock, and 2) LD back-to-back hitting during non-operational shock. We studied a few potential HAMR HGA designs, also analyzed a design that improves drive op-shock performances.

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Active-Passive Vibration Control for Fans in the Data Server

ASME 2021 30th Conference on Information Storage and Processing Systems ◽

10.1115/isps2021-65266 ◽

2021 ◽

Author(s):

Han-Sheng Chen ◽

Jen-Yuan (James) Chang

Keyword(s):

Control System ◽

Vibration Control ◽

Hard Disk Drives ◽

Hard Disk ◽

Data Access ◽

Disk Drive ◽

Disk Drives ◽

Mechatronic System ◽

Passive Vibration Control ◽

Analytical Approaches

Abstract The work presented in this paper aims at developing a vibration control system for fans in data server. The methods used in the work includes numerical, experimental, and analytical approaches with goal placed on developing a mechatronic system that can be used in the data server to reduce structural-born vibrations affecting data access performance in hard disk drives (HDD). It was observed that with the proposed method and system, vibrations of the server structure, the chassis, can be significantly reduced by 88%, which also enhanced the disk drive data access performance.

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Garbage Collection Algorithms in Flash-Based Solid State Drives

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.k7819.1091220 ◽

2020 ◽

Vol 9 (12) ◽

pp. 29-33

Keyword(s):

Solid State ◽

Flash Memory ◽

Garbage Collection ◽

Hard Disk Drives ◽

Window Size ◽

Disk Drives ◽

Solid State Drives ◽

Storage Media ◽

Write Amplification ◽

Data Separation

Solid state drives (SSDs)have emerged as faster and more reliable data storages over the last few years. Their intrinsic characteristics prove them to be more efficient as compared to other traditional storage media such as the Hard Disk Drives (HDDs). Issues such as write amplification, however, degrade the performance and lifespan of an SSD. This issue is in turn handled by the Garbage Collection (GC) algorithms that are put in place to supply free blocks for serving the writes being made to the flash-based SSDs and thus reduce the need of extra unnecessary writes. The LRU/FIFO, Greedy, Windowed Greedy and D choices algorithms have been described to lower write amplification for incoming writes which are different in nature. The performance of the GC algorithms varies based on factors such as pre-defined hot/cold data separation, hotness of data, uniform/non-uniform nature of incoming writes, the GC window size and the number of pages in each block of the flash memory package. Finally, it can be seen that the number of write frontiers so used, can dictate the separation of hot/cold data and increase the performance of a GC algorithm.

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Development of Algorithm to Enhance the Security Feature of SATA on Solid State Drives

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.f1039.0886s19 ◽

2019 ◽

Vol 8 (6S) ◽

pp. 193-198

Keyword(s):

Solid State ◽

Data Storage ◽

User Authentication ◽

Hard Disk Drives ◽

Hard Disk ◽

Solid State Drives ◽

Flash Memories ◽

Storage Devices ◽

Storage Media ◽

Security Feature

Now a day’s quantity of data growing day by day accordingly the size of storage media is also increasing rapidly. In most of the storage devices flash memories are used one of them is Solid State drive. Solid state drives i.e. SSDs are non-volatile data storage devices which store determined data in NAND or NOR i.e. in flash memories, which provides similar functionality like traditional hard disk (HDD). This paper provides comparative study of Solid-state drives over Hard-disk drives. Also, implementation of algorithm to enhance the security of Solid-state drives in terms of user authentication, access control and media recovery from ATA security feature set. This algorithm fulfils security principles like Authentication and Data Integrity.

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