Hitachi Part #/MPN: 0B21253
DiscTech Item #: HIT-0B21253-FR-OE
- Factory RefurbishedCondition Levels Explained
The product has been built, rebuilt or repaired at the original manufacturer's factory (Note we NEVER sell 3rd party repaired items, as we do not find them to be reliable enough). Often these products are extremely close to new in condition, except that they contain at least one recycled or repaired component. Failure rates are often lower on these devices since they have been far more thoroughly tested than new items.
Product Warranties ExplainedThe product has a manufacturer warranty for the time period specified.
- Warranty:1 Year DiscTechProduct Warranties Explained
The product has a DiscTech warranty for the time period specified. View our limited warranty
- Special Order - Ships in 5-10 business daysSpecial Order - Ships in 5-10 business days
This item has a lead time for fulfilment (as listed), this is approximate. Your credit card will be authorized in full on the day of ordering; it will not be charged until the day of shipment.
Capacity: 73GB
Speed: 15,000RPM
Interface Types: SCSI 80pin SCA-2 Hot-Swap
Form Factor: 3.5inx1.0in LFF Hard Drive
Sector Size: 512 / 512e
Sustained Throughput: 93.3
Average Seek Time: 3.6 / 3.7
Electrical Interface: SCSI LVD U320 - 320MBps 16-bit
On-Board Cache: 8MB
Hitachi 0B21253 / HUS151473VL3800 73GB 3.5in 15K RPM HS U320 80pin SCA-2 UltraStar 15K147 SCSI HDD - Factory Refurbished
Hitachi 0B21253 / HUS151473VL3800 73GB 3.5" 15000 RPM Hot Swap U320 80pin SCA-2 UltraStar 15K147 Small Computer System Interface Hard Disk Drive - Factory Refurbished
Alt MPN: HUS151473VL3800
Outline of the drive
- Storage capacities 73 GB
- Ultra 320
- Variable Sector Size (512-528 bytes/sector)
- Tagged Command Queuing support
- Automatic read/write data transfer
- 3.6 ms seek time in read operation
- Adaptive read ahead algorithm
- Write Cache
- Back to back write
- ECC on the fly
- Automatic defect reallocation
- Self diagnostics at power on
- Closed loop actuator servo
- High level of integration of the electronics
- Non head disk contact start stop
- Spindle rotation of 15,000 RPM
- Automatic actuator lock
- PFA (SMART)
- Glass substrate disks
Fixed-disk Subsystem Description
Control Electronics - The drive is electronically controlled by a microprocessor, logic modules, digital/analog modules and various drivers and receivers. The control electronics perform the following major functions :
- Perform self-checkout (diagnostics)
- Conduct a power-up sequence and calibrate the servo.
- Monitor various timers for head settling, servo failure, etc.
- Analyze servo signals to provide closed-loop control. These include position error signal and estimated velocity.
- Control of the voice coil motor driver to align the actuator onto a desired position.
- Monitor the actuator position and determine the target track for a seek operation.
- Constantly monitor error conditions of the servo and take corresponding action if an error occurs.
- Control starting, stopping, and rotating speed of the spindle.
- Control and interpretation of all interface signals between the host controller and the drive.
- Control of read/write accessing of the disk media, including defect management and error recovery.
Head Disk Assembly - The head/disk assembly (HDA) is assembled in a clean room environment and contains disks, a spindle motor, actuator assembly, and voice coil motor. Air is constantly circulated and filtered when the drive is operational. Venting of the HDA is accomplished via a breather filter.
The spindle is driven directly by a brushless, sensorless DC drive motor. Dynamic braking is used to stop the spindle quickly
Actuator - The read/write heads are mounted in the actuator. The actuator is a swing-arm assembly driven by a voice coil motor. A closed-loop positioning servo controls the movement of the actuator. An embedded servo data pattern supplies feedback to the positioning servo to keep the read/write heads centered over the desired track.
The actuator assembly is balanced to allow vertical or horizontal mounting without adjustment.
Heads are moved out from the disks (unloaded) to protect the disk data during shipping, moving, or storage. At power down, the heads are automatically unloaded from over the disk area and the head actuator locking mechanism will secure the heads in the unload position.
Compatibility:
This drive is compatible with any server that accepts 3.5" x 1" (LFF) 80-pin SCSI hard drives.
| Drive Model | 0B21253 |
|---|---|
| FORMATTED CAPACITY | |
| Label Capacity | 73 GB |
| Number of Heads | 5 |
| Number of Disks | 3 |
| Total Data Bytes (512 Bytes/Sector) | 73,407,900,160 |
| Total Logical Data Blocks | 143,374,805 (88BB9D5h) |
| Hot Swappable | Yes |
| DATA SHEET | |
| Buffer to/from Media | 760 - 1129 Mb/sec |
| Host to/from Buffer (Interface Transfer Rate) | 320[MB/sec] |
| Data Buffer Size | 16MB |
| Number of Buffer Segments | 1 - 256 |
| Rotational Speed | 15,000 RPM |
| Recording Density | 686 [Kbpi] (Max) |
| Track Density | 90,000 [TPI] (Average) |
| Areal Density | 61.7 [Gb/sq. in] |
| Data Zone | 24 |
| INQUIRY INFORMATION | |
| Product ID | HUS151473VL3800 |
| Description | 80-pin |
| MECHANICAL POSITIONING | |
| Average Seek Time (Read/Write, Typical) | 3.6/4.0 ms |
| Average Seek Time (Read/Write, Max) | 3.8/4.1 ms |
| Full Stroke Seek Time (Read/Write, Typical) | 6.6/6.9 ms |
| Full Stroke Seek Time (Read/Write, Max) | 6.9/7.5 ms |
| Average Latency | 2.0 ms |
| Average Latency Time for a Revolution | 4.0 ms |
| Drive Ready Time(Typical, sec) | 14.3 |
| Drive Ready Time(Max, sec) | 29.9 |
| Spindle Stop Time(Typical, sec) | 9 |
| Data Transfer Speed | 93.3 MB/s |
| Cache | 8MB |
| MECHANICAL DIMENSIONS | |
| Height(mm/in) | 26.1/1.0276 |
| Width(mm/in) | 101.85/4.010 |
| Lenth(mm/in) | 146.6/5.772 |
| Weight(g/lb) | 741/1.634 |
Click here to view the manufacturer's item description/brochure
Alternate MPNs: HUS151473VL3800
Weight: 1.8 lb
Warranty: 1 Year DiscTech
Factory Refurbished
The product has been built, rebuilt or repaired at the original manufacturer's factory (Note we NEVER sell 3rd party repaired items, as we do not find them to be reliable enough). Often these products are extremely close to new in condition, except that they contain at least one recycled or repaired component. Failure rates are often lower on these devices since they have been far more thoroughly tested than new items.
The product has a manufacturer warranty for the time period specified.
1 Year DiscTech Warranty
The product has a DiscTech warranty for the time period specified. View our limited warranty