“For the 4TB, the Cache Buffer Size is 64MB or 256MB? I only see a 256M for 4TB on WD website. Is this WD4005FZBX?”

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• According to the WD datasheet, this drive has only a 64mb cache, at least the drive I purchased in-store. Even the specs on this page shows 64mb cache. I'm not happy b/c the store sales person swore it had a 256mb cache (buffer). Not so. The model number I received is "WDBSLA0040HNC-NRSN" Amazon is selling a Black 4TB drive with 256mb cache for about $128

  Answered by Mike 3 years ago

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• 256MB on all black drives 4TB and up.

  Answered by Nerderror404 3 years ago

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• Hello, WD_BLACK™ is purpose-built to enhance your PC gaming experience. Available with an impressive 256 MiB of DRAM cache on higher capacity models. To know more about the drive please refer the below link: https://bit.ly/33SfMYj .Please see our "'Contact Us" page for information.

  Answered by Western Digital Team 4 years ago

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