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HP 462975-001 512MB Battery Backed Write CAC — main product image
HP 462975-001 512MB Battery Backed Write CAC
HP 462975-001 512MB Battery Backed Write CAC
HP 462975-001 512MB Battery Backed Write CAC
HP 462975-001 512MB Battery Backed Write CAC
HP

HP 462975-001 512MB Battery Backed Write CAC

HP 512MB battery backed write cache module safeguards server data integrity while boosting write performance.

$18.49*
✓ In Stock on Amazon.com
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*Price sourced from Amazon.com. Last updated:Jun 04, 2026.Price and availability are subject to change.

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Overview

The HP 462975-001 512MB Battery Backed Write Cache module is a purpose-built component designed to enhance write performance on compatible HP ProLiant server RAID controllers. By caching write operations in 512MB of onboard memory before committing them to disk, the module allows the controller to operate in write-back mode — significantly faster than write-through — without risking data loss. The integrated battery ensures that cached data is preserved during power interruptions, giving the system time to flush pending writes once power is restored.

This module is typically purchased as a replacement for a failed or degraded BBWC unit, or as an addition to a RAID controller that shipped without one. Installation is straightforward on supported hardware, requiring only that the module be seated into the controller's cache slot. Buyers should confirm compatibility with their specific server model and RAID controller, as this part number supports a defined range of HP hardware. While 512MB is modest by modern standards, it remains effective for the server generations this module was designed to support.

Key Features

462975-001

HP

HP 462975-001 HP 462975-001 SmartArray 512MB cache memory card

HP 462975-001 HP 462975-001 SmartArray 512MB cache memory card

462975-001

Specifications

Brand
HP
Model
462975-001
Capacity
512MB
Type
Battery Backed Write Cache (BBWC) Memory Module

Pros & Cons

👍 Pros

  • Battery backup preserves cached data during unexpected power loss
  • 512MB cache capacity accelerates write-heavy server workloads
  • Drop-in replacement for failed or aging BBWC modules in compatible HP servers
  • Relatively inexpensive way to restore or add write-back caching to a RAID controller

👎 Cons

  • Limited to 512MB capacity, which is small by current server cache standards
  • Only compatible with specific HP ProLiant servers and RAID controllers
  • Battery lifespan is finite and may already be partially depleted on older stock
  • Does not improve read performance, only write caching operations

Frequently Asked Questions

This module is designed for HP ProLiant servers that support the 462975-001 battery backed write cache. Check your server's and RAID controller's compatibility list before purchasing.
The onboard battery maintains cached write data in the event of a power loss, allowing the RAID controller to flush pending writes to disk once power is restored, preventing data corruption.
This module provides 512MB of cache memory for buffering write operations before they are committed to the disk array.
The module includes integrated battery backup. However, batteries degrade over time, so replacement may be needed if the unit has been in service for several years.

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