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872491-B21 ✓ Verified by PartsTable
HP · STORAGE_HDD · 3.5_SATA_HDD
WHAT YOU NEED TO KNOW
SAS backplane supports SATA, not vice versa NL-SAS = SAS protocol at nearline (7.2K) speed — NOT SATA
Gen8 LFF tray ≠ Gen10 tray — different screw holes
PRODUCT OVERVIEW
HP 4TB 7.2K 6G SATA 3.5 SC DS HDD

HP 4TB 7.2K 6G SATA 3.5 SC DS HDD. The unit ships in a LFF form factor suitable for standard rack-mount installations. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 7025-01-718-4244, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
STORAGE_HDD→ 3.5_SATA_HDD→ LFF BAY→ 872491-B21
NSN: 7025-01-718-4244
FSC: 7025
CAGE: 7ES51 — HEWLETT PACKARD ENTERPRISE COMPANY (USA)
SPECIFICATIONS
Part Number872491-B21
ManufacturerHP
Form FactorLFF
Capacity4TB
Speed7.2K RPM
NSN7025-01-718-4244
COMPONENT DIAGRAM
RELEASE LATCH 4TB NL-SAS 7.2K RPM 872491-B21 HP NL-SAS INTERFACE INTERPOSER SAS drive in SATA tray? Check board compatibility 3.5" (101.6 x 146mm) LFF 3.5" DRIVE | 4TB | NL-SAS 7.2K RPM NL-SAS uses SAS protocol at 7.2K RPM | SAS backplane supports SATA, not reverse Tray generation matters | Gen8 LFF tray differs from Gen10 TITLE LFF 3.5" DRIVE PN 872491-B21 MFR HP
KEY FEATURES
•
LFF Form Factor
•
4TB Capacity
•
7.2K RPM Speed
•
DRIVE QUANTITY: 1
•
UNIT DESIGN: INTERNAL
•
DATA STORAGE CAPACITY: 4.0 TERABYTES
•
DESIGN TYPE: HARD DISK
•
INTERFACE TYPE: SERIAL ADVANCED TECHNOLOGY ATTACHMENT
TYPICAL APPLICATIONS
  • Enterprise storage arrays and SANs
  • Direct-attached storage (DAS) expansion
  • Database tier storage (OLTP, OLAP)
  • Virtual machine datastore expansion
  • Backup-to-disk and disaster recovery targets
  • Content delivery and media streaming storage
TECHNICAL CHARACTERISTICS (FLIS)
DRIVE QUANTITY1
UNIT DESIGNINTERNAL
PART NAME ASSIGNED BY CONTROLLING AGENCYHARD DISK DRIVE
DATA STORAGE CAPACITY4.0 TERABYTES
DESIGN TYPEHARD DISK
OVERALL HEIGHT26.8 MILLIMETERS NOMINAL MM
INTERFACE TYPESERIAL ADVANCED TECHNOLOGY ATTACHMENT
DRIVE QUANTITY1
UNIT DESIGNINTERNAL
PART NAME ASSIGNED BY CONTROLLING AGENCYHARD DISK DRIVE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
872772-001Interchangeable
HP 4TB 7.2k 6G SATA 3.5 Sc Ds HDD
interchangeable
846522-004Compatible
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF HDD - Bare Drive
compatible
872293-002Compatible
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF HDD - Bare Drive
compatible
872295-002Compatible
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF HDD - Bare Drive
compatible
872491-K21Compatible
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
compatible
879481-001Compatible
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF HDD - Bare Drive
compatible
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 19
879481-001SUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
MB004000GWFVUSUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
MB004000GWFWBSUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
MB004000GWKGVSUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
MB4000GVYZKSUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
P03714-B21SUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
P03750-001SUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
P06388-B21SUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
P06464-001SUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
846522-004SUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
861683-B21SUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
861683-H21SUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
861683-K21SUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
861683-X21SUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
862133-001SUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
872293-002SUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
872295-002SUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
872491-K21SUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
872772-001SUBSTITUTE
HP 4Tb SATA 6G 7.2K 512n Digitally Signed MDL LFF SC HDD
HPE
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FREQUENTLY ASKED QUESTIONS
What is 872491-B21?
872491-B21 is a HP 4TB 7.2k 6G SATA 3.5 Sc Ds HDD manufactured by HP. It is classified as a STORAGE_HDD (3.5_SATA_HDD).
What parts can replace 872491-B21?
There are 12 known substitutes for 872491-B21: 872772-001, 846522-004, 872293-002 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 872491-B21?
872491-B21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 7025-01-718-4244. This indicates validated use in U.S. government and defense supply chains.
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Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
Last verified: July 2026