Replacement for 877541-B21: Drop-In Alternatives We Stock
Looking for a replacement for the 877541-B21 (877541-B21 - HP 1.8TB SAS Hard Drive)? Pro Disk Network ships HP drop-in replacements and equivalent modern parts from US inventory. Every alternate below is in-stock today with same-day shipping for orders placed before 2pm ET. If your unit is still under warranty, contact our engineering team — we offer cross-shipping for B2B customers on Net 30 terms.
About the 877541-B21
| SKU | 877541-B21 |
|---|---|
| Product | 877541-B21 - HP 1.8TB SAS Hard Drive |
| Current price | $1,094.96 |
| Stock status | In Stock |
| Detail page | View 877541-B21 › |
Drop-in replacements for 877541-B21
Each part below is currently in our US warehouse, ships same-day for orders before 2pm ET, and includes our 90-day warranty. SKUs link to the full product page with photos, datasheets and B2B quote form.
K2R09A - HP External SAS Cable Mini-SAS/Mini-SAS HD for Server 6.56 ft 1 x SFF-8644 Mini-SAS HD 4 x SFF-8088 Mini-SAS Shielding
SKU: K2R09A
Price: $560.25
K2R84A - HP Modular Smart Array 2040 SAS Dual Controller SFF Storage Hard Drive Array 24 Bays ( SAS-2 ) SAS 12GB/s (External) Rackmountable 2u
SKU: K2R84A
Price: $2,503.16
AX669A - HP StorageWorks MDS600 Hard Drive Array 31.5TB 70 x 450GB SAS Hard Drive Serial Attached SCSI Mini-SAS
SKU: AX669A
Price: $7,858.46
727290-001 - HP 450GB 10000RPM 6Gb/s SAS 2.5-Inch Hard Drive for M6710 SAS Drive Enclosure
SKU: 727290-001
Price: $294.74
742080-002 - HP 3TB 7200RPM SAS 6Gb/s 3.5-inch Nearline Hard Drive for M6720 SAS Drive Enclosure
SKU: 742080-002
Price: $382.68
AD335A - HP 512MB ECC DDR2 PCI Express Up to 300Mb/s 2 x Mini-SAS SAS 300 Serial Attached SCSI External 2 x SFF SAS RAID Controller
SKU: AD335A
Price: $194.74
AJ941A - HP StorageWorks D2700 Hard Drive Enclosure Storage Enclosure 25 x 2.5-inch Front Accessible SAS SAS Rack-mountable
SKU: AJ941A
Price: $170.53
784621-001 - HP Mini-SAS Cable Assembly Kit includes two Mini-SAS Cables for Connection 8-Bay SFF Hard Drive Cage to Controller Board
SKU: 784621-001
Price: $181.05
AT459A - HP StorageWorks SB40C Hard Drive Array SAS/Serial ATA Controller RAID Supported 6 x Total Bays eSATA 4U Rack-mountable with 6 X 300GB SAS
SKU: AT459A
Price: $1,315.03
QK770A - HP D2700 Das Array 10 X 1TB 10TB Installed Hard Drive Capacity Serial Attached SCSI SAS Controller 25 X Total Bays 6GB/s SAS 2u Rack-mountable
SKU: QK770A
Price: $4,824.09
AW594B - HP Modular Smart Array P2000 G3 SAS Dual Controller SFF Array System Hard Drive Array 24-Bay 0 Hard Drive (aw
SKU: AW594B
Price: $3,568.80
SLTN0900S5xnF010 - HP 900GB 10000RPM SAS 6Gb/s SFF Hard Drive HARD
SKU: SLTN0900S5xnF010
Price: $221.05
How we pick replacements
Every recommendation above was selected using these criteria:
- Drop-in compatibility — same form factor (2.5"/3.5", PCIe slot, SFP port, etc.), so it fits the original chassis without modification
- Equivalent or better performance — matched on RPM/IOPS/speed/throughput, never downgraded
- Same-brand-preferred — we list the OEM-equivalent first when available, then trusted aftermarket
- Warranty coverage — 90-day Pro Disk warranty on every part, with 1-year option for B2B
- In stock today — never recommend a part that is on backorder
Need help confirming compatibility?
Our engineers validate every replacement against your specific server, switch, or chassis model before shipment. Email sales@prodisknetwork.com with your platform model (e.g., Dell PowerEdge R740, HP DL380 Gen10, Cisco Catalyst 9300) and we will confirm the exact part number that drops into your hardware.