Reactive Group Solid State Disks Ltd SCSIFLASH Arraid, LLC SCSI SDD


SMD Disk Drive Emulation

The Arraid AEM-1 system provides a new and warranted equipment replacement for disk drives that adhere to the obsolete industry standard, SMD interface protocol and its successors: SMD-O, SMD-H and SMD-E.

The AEM-1 is plug-compatible with the original aging SMD drive, while using ARRAID's proprietary solid state 'ARRAID Flash Drive' (AFD) to store data.  Internal AEM rotating drives (disk, tape & magneto-optic) can still be supported upon request.

No host system software or controller changes are required to install the AEM-1.

Capacities: 40MB SMD to 2.5GB SMD-E

Get the AEM-1 Data Sheet

Manufacturer: Arraid, LLC

The AEM-1 provides a complete bridge between the host SMD controller and the AEM's internal data storage drives. SMD drives drives were widely used on computer systems since the late '70s and are still in use today on systems with specialized functions and custom software, making it impractical to re-host the complete computer system. Originally built as free standing floor models with removable disk packs, these drives were also produced in several styles of rack mount with removable packs, fixed - sealed media, or a combination of both.

While refurbished SMD replacements have limited availability, refurbished SMD drives commonly fail within a few months resulting in system down time. The AEM-1 is provided as new equipment, allowing customers to utilize SCSI drives or ARRAID's proprietary solid state 'ARRAID Flash Drive' (AFD) installed in the AEM-1, with MTBF of 200,000+ hours and significantly more when using the solid state AFD.

Additional AEM-1 options include disk to disk backup, disk to tape backup, AFD network (backup & restore) and mirroring. No refurbished SMD replacement can match the reliability, features and customer support provided by choosing the AEM-1 to replace your aging and refurbished SMD disk drives.

Contact Arraid today to learn more about new drive replacements for aging computer systems.


Features and Benefits

  • Replaces aging and refurbished SMD drives with new data storage technology.
  • ARRAID Flash Drive (AFD) option is a Solid State SCSI disk replacing traditional mechanical SCSI drives (DAT, QIC, Tape & Magneto Optical Disk)
  • Additional features such as network backup, mirroring, restore and removable media can be added.
  • The CompactFlash (CF) media in the ARRAID Flash Drive (AFD) is treated exactly the same as the floppy disk media. All drive data is stored on the CF media as if were the original diskette media.
  • AFD network feature option offers LAN network (ethernet-based) back-up and restore capability directly from the AFD using the on board RJ45 Network port. No additional software or register changes are required to the legacy host. Including ARRAIDs FLASH2GUI Software, an optional ethernet support feature for centralised backup and restore capability lessening the reliance to rotate media.  Network option only available on AEM with AFD network drive installed. 
  • Easy to install. No hardware or software changes required, other than the drive itself.
  • Can replace or be added to existing drives.
  • An LED or Alpha-Numeric Operator Panel provides the same controls as the original drive.
    • Minimal Operator training required.
  • High reliability with near zero maintenance required.
    • Greater computer system availability with lower cost of ownership.
  • AEM data storage can be to removable media, regardless of the original media. Ideal for secure applications.
  • Reduced power consumption compared to original SMD drives
  • The AEM is configured using internal software. The same model will emulate a wide range of disk drives.
    • System disk capacity may be increased if required.
    • Using the same AEM model for several drives limits the spares requirement.


For More Information

Get the AEM-1 Data Sheet

Learn how the AEM-1 replaces SMD, SMD-O, SMD-H, SMD-E, and XMD drive interfaces using Disk Drive Emulation.

Unable to determine if the AEM-1 is right for your application? Contact Arraid representatives here

Can Replace

A Brief List of Some of the SMD Drives the AEM-1 Can Replace (Manufacturer and Drive Models) 

ADS SMD - Series 8
Alpha Data SMD - Atlas 520
AmcoDyne SMD - 7130, 7110, 8160
AMPEX SMD - 330, 660, 825, 165, 330, DFR-932, DFR-964, DFR-996, DM-9100, DM-9160, DM-9200, DM-9300, DM-940, DM-940
APS SMD - 4835, 4865
BALL SMD - BD50, BD80, BD100, BD160
BASF SMD - 6171, 6172
CDC SMD - 9412, 9448, 9455 Lark 1, 9457, 9710, 9715, 9720, 9730, 9760, 9762, 9764, 9766
CDC SMD - 9771, 9772, 9773, 9775, 9782, 9783
CDS SMD - AMS 315, AMS 380, AMS 513, AMS 571, AMS 615, AMS M315
CDS SMD - C2400, C2476, C2600, C2602, C2800
DDC Pertec SMD - DX1246, DX199, DX265, DX332, DX368, DX375, DX548, DX731, DX914
DG SMD - KISMET 6160, KISMIT 6161, KISMET 6214, VULCAN 6122, ZEBRA 6067, ZEBRA 6060, ZEBRA 6061
Fujitsu SMD - M2280, M2284, M2294, M2298, M2312K, M2322K, M2333K, M2344K
Fujitsu SMD - M2350A, M2351A, M2360A, M2361A, M2372K, M2380A, M2382K, M2392K
Gould SMD - 8840, 9346
Hitachi SMD - DK512S, DK514S, DK711S, DK801, DK812S, DK814S, DK815
Honeywell SMD - MSU9602, MSU9604
Mega Vault SMD - 116
Memorex SMD - 214, 612, 659, 677
Miltope SMD - RDS-2342, RDS-2344
Mitsubishi - M2839F, M2853F, M2854F, M2860, M2883, M2884, M4870, M4875
NEC SMD - 5682, D2246. D2247. D2257, D2268, D2300, D2332, D2352, D2362, D2363, D2373
Northern Telecom SMD - Mercury 8208, Mercury 8210, Mercury 8212, Mercury 8308, Mercury 8312, Mercury 8408
Northern Telecom SMD - Mercury 8412, Mercury 8414, Mercury 8508, Mercury 8512, Mercury 8514
Priam SMD - 15450, 3350, 3450, 6650, 7050, 803, 804, 806, 807, 808
Seagate SMD - ST41097 Elite, ST41201 Elite, ST81123 Sabre, ST81236 Sabre, ST82272 Sabre, ST82500 Sabre, ST8851 Sabre
Sperry SMD - Locust
Tandem SMD - 4104, 4114, 4116, 4120, 4130
Tech Labs SMD - WL-84-D
Storage Tec SMD - 160, 200, 3005, 3010, 3020
Toshiba SMD - MK-182FB, MK-184FB, MK-186FB, MK-286FC, MK-288FC, MK-388FA
Wang SMD - 2265, 2267, 2268, 2280, 6565, 6568, 6580V

Standard Models, Enclosures and Options

AEM-1 Versions

  • The AEM-1A will emulate SMD and SMD-O disk drives, with track lengths up to 32KB and transfer rates <2MB/sec. Capacities range from 40MB to 1GB.
  • The AEM-1B will emulate SMD through SMD-E disk drive, with track lengths up to 64KB and transfer rates to 3MB/sec. Capacities range up to 3.3GB.
  • The AEM-1C is a fully cached version of the AEM and can be configured to emulate most standard drives. Like the 1B, the AEM-1C will emulate SMD through SMD-E disk drives, with capacities up to 2GB.



Mounting for Primary SCSI Storage Device

The legacy disk drive image is stored on the primary SCSI storage device. AEM-1 Systems may be configured with either fixed or removable SCSI disk drives as the primary SCSI storage device. SCSI disk drives are ordered separately. For **F enclosures, the drive is fixed mounted inside the system enclosure. **RM enclosures include drive bays for removable disk drive modules. The drive bays have a key lock switch for mechanical and electrical interlock. The Customer can have the convenience of removability for security or media distribution, regardless of the construction of the original disk drive.

SCSI Storage Devices

SCSI Storage Devices

An AEM-1 System always requires a primary SCSI storage device and may require one or more additional devices for split media support or internal copy/backup. Because of the variety of SCSI products available, all AEM SCSI devices must be defined separately from the AEM.

The usual choice for the primary storage device is a hard drive. The drive may be in a fixed internal mounting or in a removable drive canister.
Note: As of December 2005, 50 pin drive models (DRV-45 and DRV-45R) have been discontinued as the 50 pin drive bays and canisters to support them are no longer available. All current AEM models use 80 pin hard drives as primary storage devices in both fixed and removable enclosures (DRV-45 and DRVM-45R). Drives are not interchangeable. Existing AEMs may be retrofit to support the 80 pin drives. Contact your Arraid Representative for details.

Magneto-Optical drives have proven successful as the primary storage device in many applications, especially when used in a fully cached AEM-1C. Excellent as internal copy/backup devices, these drives and media have the durability to perform well for many years. MO devices are only available for fixed mounting.

Arraid also supports DDS3 DAT drives as internal backup devices.

Internal Options - Copy/Backup

The AEM-1 supports a number of internal options that provide the capability to copy the legacy disk image from the primary SCSI device to a second SCSI device. The copying takes place internally to the AEM, and is independent of the Customer's operating software or hardware. Usually used for system backup, these options can greatly reduce or eliminate the need for a magnetic tape drive on the system.

  • Disk-to-Disk Off-Line Copy - Allows the User to clone emulated disk images from the primary SCSI device to a second, usually identical, SCSI device for backup purposes.
  • Disk-to-Cartridge Media Disk Off-line Copy - Allows the User to clone emulated disk images from the primary SCSI device to a second SCSI device, such as an MO cartridge disk, for backup or distribution of media among similar systems.
  • Disk-to-Tape Off-line Backup - Allows the User to create a backup copy of the emulated disk image on DAT.
  • Disk-to-Disk On-Line Copy - Similar to mirroring, the AEM automatically maintains two copies of the emulated image on two SCSI hard drives for added reliability and fault tolerance.
  • Disk-to-Cartridge Media Disk On-line Copy - Allows the User to clone emulated disk images from the primary SCSI device to a second SCSI device, such as an MO cartridge disk, without taking the AEM off-line.
  • Combinations of Above Options

Other Internal Options

  • Dual Port SMD Interface - Allows two computers to access the same disk drive. Only required if the original drive was dual ported.
  • Fixed/Removable Emulation - Emulates those drives where the drive capacity is split between fixed platters and a removable cartridge.
  • Multi-Volume Support - Allows storage of multiple legacy disk images on one SCSI device.
  • Additional Crystals - The crystal controls the drive transfer rate. In cases where a spare drive must be reconfigurable to emulate several different legacy models in use, the Customer may require additional crystals.
  • Additional Track Buffers - Depending upon the Customer's application, caching a larger portion of the disk emulation in additional track buffers may improve performance.
  • Interface Connectors - Older SMD drives used large Amphenol block connecters rather than the now standard IDC.

External Options

  • Interface Cables
  • Cable Termination
  • Mounting Shelf
  • EU Certification

Contact Arraid Representative for advice and assistance in selecting AEM-1 Devices and Options.

Our Partners