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JMicron’s USB storage device controllers have enhanced data transmission performance by the USB Attached SCSI data transmission protocol (UASP), as well as an associated internal hardware accelerator that maximizes sequential and random data read/write rates. All USB storage device controllers are required to go through the USB compliance test before they are released to market to ensure full compatibility with prevailing USB hosts and SATA devices.

JMicron deliberately designs in ultra-fast read/write channels, highly efficient layout designs, and powerful cryptographic engines.

Our expertise in high-speed physical layer (PHY) of USB and SATA formats, as well as excellence in RAID hardware design enables JMicron to provide a wide selection of data storage controllers. By combining these controllers as building blocks, customers can not only configure their hard disk drives (HDDs), but solid state drives (SSDs) as well. External data storage devices can be used for redundant data storage, additioanl data storage, or convenient data retrieval from the field.

Our core technology of external storage devices

• USB Attached SCSI data transmission protocol (UASP): enhance the data transmission performance
• Hardware RAID engine design: optimize the scalability of data storage.
• Internal hardware accelerator: maximize the sequential and random data read/write rates.
• USB compliance test: ensure full compatibility with prevailing USB hosts and SATA devices.

JMicron’s Solutions

Single Bay Controller

JMicron’s a series of single bay controllers for USB 2.0/ USB 3.0/ USB 3.1/ USB 3.2 host interfaces.

Devices application

• External USB DAS
• USB-native HDDs
• USB enclosure
• Smart TV storage devices
• Gaming console storage devices
• Window-to-go applications

Dual-/Multi-Bay Controller

JMicron’s a series of dual-/ multi-bay bridge controllers for external multiple-bay HDDs, RAID, and SATA Port Multipliers and SATA Port Selectors.

Devices application

• NAS
• Personal Cloud Storage
• Hyper Backup
• Active Backup
• Cloud Station Backup

Solutions for External Storage

• USB 3.1 Gen2 to PCIe/NVMe Gen3x2
• Support TCG pass-through and TRIM command
• Comply with USB Mass Storage Class BOT and UASP

• USB 3.1 Gen2 to SATA 6Gbps
• Support external USB Type-C PD controller
• Support TRIM command for SSD and comply with BOT/UASP specification

• USB 3.1 Gen1 to SATA 6Gbps
• Comply with UASP specification
• Provide a low power and high-performance solution for SSD/HDD/ODD

• USB 3.1 Gen1 to SATA 6Gbps
• Support TCPC controller/ UASP/ BOT
• An integrated Type-C Multiplexer & Device CC control logic for Type-C storage solution

• USB 3.0 + eSATA 6Gbps to Dual SATA 6Gbps
• RAID 0 / 1 / JBOD

Digital Data Storage (DDS) is a computerdata storage technology that is based upon the Digital Audio Tape (DAT) format that was developed during the 1980s. DDS is primarily intended for use as off-line storage, especially for generating backup copies of working data.

A DDS cartridge uses tape with a width of 3.81mm, with the exception of the latest formats, DAT-160 and DAT-320, both which use 8mm wide tape. Initially, the tape was 60 meters (197 feet) or 90 meters (295 ft.) in length. Advancements in materials technology have allowed the length to be increased significantly in successive versions. A DDS tape drive uses helical scan recording, the same process used by a video cassette recorder (VCR).

Backward compatibility between newer drives and older cartridges is not assured; the compatibility matrices provided by manufacturers will need to be consulted.^[1] Typically drives can read and write tapes in the prior generation format, with most (but not all) also able to read and write tapes from two generations prior. Notice in HP's article that newer tape standards do not simply consist of longer tapes; with DDS-2, for example, the track was narrower than with DDS-1.

At one time, DDS competed against the Linear Tape-Open (LTO), Advanced Intelligent Tape (AIT), VXA, and Travan formats. However, AIT, Travan and VXA are no longer mainstream, and the capacity of LTO has far exceeded that of the most recent DDS standard, DDS-320.

Generations[edit]

DDS-1[edit]

Stores up to 1.3 GB uncompressed (2.6 GB compressed) on a 60 m cartridge or 2 GB uncompressed (4 GB compressed) on a 90 m cartridge.

The DDS-1 cartridge often does not have the -1 designation, as initially it was the only format, though cartridges produced since the introduction of DDS-2 may carry a -1 designation to distinguish the format from newer formats. A media recognition system was introduced with DDS-2 drives and cartridges to detect the medium type and prevent the loading of an improper medium. From 1993, DDS-1 tapes included the media recognition system marks on the leader tape—a feature indicated by the presence of four vertical bars after the DDS logo.

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DDS-2[edit]

Stores up to 4 GB uncompressed (8 GB compressed) on a 120 m cartridge.

DDS-3[edit]

Stores up to 12 GB uncompressed (24 GB compressed) on a 125 m cartridge. DDS-3 uses PRML (Partial Response Maximum Likelihood) to minimize electronic noise for a cleaner data recording.

DDS-4[edit]

DDS-4 stores up to 20 GB uncompressed (40 GB compressed) on a 150 m cartridge. This format is also called DAT 40.

DAT 72[edit]

DAT 72 stores up to 36 GB uncompressed (72 GB compressed) on a 170 m cartridge. The DAT 72 standard was developed by HP and Certance. It has the same form-factor as DDS-3 and -4 and is sometimes referred to as DDS-5.

DAT 160[edit]

DAT 160 was launched in June 2007 by HP, stores up to 80 GB uncompressed (160 GB compressed). A major change from the previous generations is the width of the tape. DAT 160 uses 8 mm wide tape in a slightly thicker cartridge while all prior versions use 3.81 mm wide tape. Despite the difference in tape widths, DAT 160 drives can load DAT-72 and DAT-40 (DDS-4) cartridges. Native capacity is 80 GB and native transfer rate was raised to 6.9 MB/s, mostly due to prolonging head/tape contact to 180° (compared to 90° previously).^[3] Launch interfaces were Parallel SCSI and USB, with SAS interface released later.

DAT 320[edit]

In November 2009 HP announced the DAT-320 standard, which stores up to 160 GB uncompressed (marketed as 320 GB assuming 2:1 compression) per cartridge. Native transfer rate was raised to 12 MB/s.

Future[edit]

The next format, Gen 8, was canceled.

Official standards[edit]

• ECMA-139ISO/IEC 10777:1991, Specification of DDS. [1]
• ECMA-146ISO/IEC 11321:1992, Specification of DATA/DAT. [2]
• ECMA-150ISO/IEC 11557:1992, Specification of DDS-DC (DDS w/ compression). [3]
• ECMA-151ISO/IEC 11558:1992, Specification of DCLZ (compression algorithm). [4]
• ECMA-170ISO/IEC 12447:1993, Specification of DDS (for 60m and 90m tapes). [5]
• ECMA-171ISO/IEC 12448:1993, Specification of DATA/DAT-DC (for 60m and 90m tapes). [6]
• ECMA-198ISO/IEC 13923, Specification of DDS-2. [7]
• ECMA-236ISO/IEC 15521, Specification of DDS-3. [8]
• ECMA-288ISO/IEC 17462, Specification of DDS-4. [9]

See also[edit]

References[edit]

Download Certance SCSI & RAID Devices Driver

1. ^Compatibility matrix for: HP, IBM
2. ^'HP DAT 320 320GB Data Cartridge - DAT & DDS tape cartridges - HP: Q2032A:'. Hewlett-Packard. Archived from the original on 2014-01-01. Retrieved 2013-12-31.
3. ^'DAT Technology'. DAT Manufacturers Group. Archived from the original on 2013-05-31. Retrieved 2013-03-31.CS1 maint: bot: original URL status unknown (link)

External links[edit]