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2.5 inch SAS hard drive with hot-swap tray

HP

HP 384842-B21 internal hard drive

SKU CH-Y4CH-XZHCS MPN 384842-B21

A 72 GB SAS 300 drive spinning at 10000 RPM in a hot-swappable 2.5" tray

  • Total capacity72 GB
  • Interface typeSAS 300
  • Form factor2.5 in (6.35 cm)
  • Rotational speed10,000 RPM
  • Key featuresHard Drive Interface: SAS 300 Maximum External Data Transfer
  • 72 GB capacity stores critical business data
  • 10,000 RPM spindle speed accelerates read/write performance
  • SAS 300 interface delivers 300 MBps transfer rate
  • 5-inch form factor fits dense server bays
  • Hot-swappable design enables drive replacement without downtime

What this drive is and who it fits

The HP 384842-B21 is a 72 GB 2.5 inch SAS hard drive spinning at 10000 RPM. It is built for servers or workstations that need hot-swappable storage in a small form factor. The dual-port SAS 300 interface delivers up to 300 MBps external transfer rate. This drive suits IT teams replacing a failed drive in an existing HP array or expanding capacity in a compatible bay.

Check your system before ordering

Verify that your chassis accepts 2.5 inch SAS drives and that the backplane or controller supports the SAS 300 interface. The drive requires a hot-swap tray and a dual-port SAS connection for full redundancy. Confirm the drive tray matches your enclosure; tray design varies by generation. Ensure your RAID or HBA firmware recognises 72 GB drives before installation.

Thermals noise and power in normal use

At 10000 RPM the drive generates measurable heat and audible seek noise typical of enterprise spindles. Airflow across the 2.5 inch body is required to keep temperatures within specification. Power draw follows standard SAS 300 limits for this capacity class. Acoustic output is noticeable in quiet offices but normal for a rack environment.

How it compares

Measured against everything we stock in 3.5-Inch Internal Desktop HDDs, at today’s prices. Recalculated every night.

Price $107.99
Typical for this category: the median of 4,938 items is $107.99.
Total capacity 72 GB
Lower than about 98% of the 2,372 comparable items (median 2 TB).
Price per TB $1,499.86 per TB
Pricier than about 91% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameHP
Model name384842-B21
Total capacity72 GB
Performance
Rotational speed10,000 RPM
Ports & slots
Interface typeSAS 300
Size & build
Form factor2.5 in (6.35 cm)
Shipping weight0.91 kg
Package size152 × 102 × 51 mm

Questions about this item

Does the HP 384842-B21 come with a mounting tray or do I need to buy one separately?

The supplier description states the drive includes a tray, so no separate tray purchase is required.

Should I choose the 72 GB or 72.8 GB capacity figure for this drive?

Both figures refer to the same drive; 72 GB is the standard marketed capacity while 72.8 GB reflects the formatted binary size.

What does the 300 MBps SAS 300 transfer rate mean for real-world performance?

It is the maximum external interface speed; actual throughput will be lower and limited by the 10000 RPM mechanical latency.

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