# Matched Pair (2x Drives) — Crucial M4 512GB 2.5" SATA III SSDs
**Total Storage: 1.024 TB | Micron 25nm Synchronous MLC NAND**
**Identical Production Pair | 0 Bad Sectors | 64% Wear Life | 100% Health Verified**Up for sale is a matched redundant pair of (2) genuine **Crucial M4 512GB 2.5-inch SATA SSDs** (Part: CT512M4SSD2).These two drives were installed side-by-side in a redundant enterprise chassis from day one, resulting in matched operational hours, identical wear profiles, and matching firmware. They make an ideal, cost-effective setup for a mirrored ZFS boot pool (TrueNAS / Proxmox), Linux mdadm RAID 1 array, or high-endurance homelab hypervisor storage.---### Verified S.M.A.R.T. Diagnostic Report (Both Drives)
Both drives were individually inspected via low-level S.M.A.R.T. logs and completely sanitized with native hardware block discard (`blkdiscard`):- **Drive A (S/N: 00000000120903317993):**
- **Reallocated Bad Sectors (ID 5):** **0** (Pristine flash array)
- **Current Pending Sectors (ID 197):** **0**
- **Program / Erase Fail Counts:** **0**
- **Power-On Time:** 83,526 Hours (33 Power Cycles)
- **Rated Life Remaining (ID 202):** **64%** (~157 TBW consumed)
- **Firmware:** **000F** (Official patched release, 83k+ hours verified completely stable)- **Drive B (S/N: 000000001209033179F0):**
- **Reallocated Bad Sectors (ID 5):** **0** (Pristine flash array)
- **Current Pending Sectors (ID 197):** **0**
- **Program / Erase Fail Counts:** **0**
- **Power-On Time:** 83,551 Hours (44 Power Cycles — within 25 hours of Drive A!)
- **Rated Life Remaining (ID 202):** **64%** (~157 TBW consumed)
- **Firmware:** **000F** (Official patched release, 83k+ hours verified completely stable)---### Why Buy Micron Synchronous MLC Over Cheap Modern SSDs?
- **True Multi-Level Cell (MLC) Reliability:** Built with genuine Micron 25nm synchronous MLC flash (rated for 3,000 to 5,000 raw P/E cycles). Even at 64% remaining wear life, these drives will outlast modern budget QLC drives (rated for only 150–300 cycles).
- **Dedicated Hardware DRAM Cache:** Driven by the Marvell 88SS9174 processor with dedicated onboard DDR DRAM cache. You will never experience the sudden I/O lag or write-cliff stalls common to modern DRAM-less drives.
- **Factory Sanitized:** Wiped clean via hardware-level block discard (`blkdiscard`). Both drives are completely unallocated and ready for immediate formatting.---### What’s Included
- (2) Crucial M4 512GB 2.5" SATA SSDs (Matching Serial Range)---### Shipping & Handling
Both drives will be safely packed in individual anti-static shielding bags and shipped in a padded box via USPS Ground Advantage with tracking provided within 1 business day.