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Small rectangular USB stick with microSD slots, black plastic finish

HPE

HPE P21868-B21 32GB microSD RAID 1 USB Boot Drive server accessory

SKU CH-3AA8-R8MC5 MPN P21868-B21

A 32 GB microSD RAID 1 USB boot drive with 28 MB/s read and 29 MB/s write speeds

  • Product typeMicroSD RAID 1 USB Boot Drive
  • DetailsUsable Capacity: 32 GB Class: UHS I Voltage: 4.0 V (min) - 6
  • RAID 1 redundancy protects boot data
  • 32 GB usable capacity stores firmware and OS
  • UHS-I Class enables 28+ MB/s read and 29+ MB/s write speeds
  • USB 2.0 compliance works with standard server ports
  • Compact 0.79" × 2.48" × 0.37" form factor fits internal slots

HPE 32GB microSD RAID 1 USB Boot Drive

The HPE P21868-B21 is a 32GB microSD RAID 1 USB boot drive designed for server deployment. It presents a single logical volume to the host while mirroring data across two internal cards for redundancy. The device connects through a standard USB interface compliant with USB specification 2.0 and operates within a 4.0V to 6.0V range.

Suited for administrators who need redundant boot

This accessory suits administrators who need redundant boot media without consuming a storage bay. Builders who require faster transfer rates or a different form factor should look at other options. The UHS I class cards deliver 28+ MB/second read and 29+ MB/second write transfer rates for reliable boot operations.

USB 2.0 compliance and UHS I class performance

The single specification that decides fit is USB 2.0 compliance combined with UHS I class performance. Servers must support boot from USB 2.0 and provide 4.0V to 6.0V power to use this drive. Physical dimensions are 0.79" x 2.48" x 0.37" and weight is 0.882 lb.

How it compares

Measured against everything we stock in Drive Cages & Server Add-Ons, at today’s prices. Recalculated every night.

Price $296.99
Pricier than about 81% of the 1,119 comparable items (median $74.99).

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Specifications

Product
Brand nameHPE
Model nameP21868-B21
Product typeMicroSD RAID 1 USB Boot Drive
Size & build
Shipping weight0.45 kg
Package size203 × 102 × 51 mm

Questions about this item

How do I install the HPE P21868-B21 into my server's internal USB port and what step is often missed?

Insert the microSD USB drive into the internal USB 2.0 header; the step often missed is enabling the USB boot option and RAID 1 mirroring in the server BIOS before installing the OS.

What maintenance or replacement will the HPE P21868-B21 need over its service life?

The dual microSD cards in RAID 1 can each be replaced individually if a card fails; no scheduled maintenance is required beyond monitoring the array health via the server management console.

What limit appears first on the HPE P21868-B21 during sustained read or write workloads?

The USB 2.0 interface caps sustained throughput at 28+ MB/s read and 29+ MB/s write, so the bus bandwidth is the first bottleneck under continuous load.

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