Pebibyte to Gigabit

PB (petabyte) = 10¹⁵ bytes = 1,000,000,000,000,000 bytes (SI decimal). PiB (pebibyte) = 2⁵⁰ bytes = 1,125,899,906,842,624 bytes (IEC binary). PiB is 12.59% larger. For a data center purchasing 100 PiB of raw storage, the SI vs IEC confusion would represent approximately 12.59 PB of missing or unexpected capacity.

Cloud providers (AWS, Azure, GCP) operate at exabyte scale but provision and bill individual customers at PiB scale for enterprise storage. Scientific computing facilities like CERN, the Square Kilometer Array telescope project, and US national laboratories store tens to hundreds of PiB. Large video platforms (Netflix, YouTube) store hundreds of PiB of encoded video content.

Using 20 TB drives (a 2024 high-density consumer drive): 1 PiB = 1,125,899,906,842,624 bytes ÷ 20,000,000,000,000 bytes/drive ≈ 56.3 drives. So roughly 57 × 20 TB drives to fill 1 PiB. In a data center using 60-drive storage shelves, one shelf of 60 × 20 TB drives provides about 1.07 PiB of raw capacity.

Magnetic tape (LTO technology) remains the dominant medium for cold storage at PiB scale due to economics and durability. An LTO-9 cartridge holds 18 TB (uncompressed) and costs roughly $100 — about $5.50 per TB, versus $15–20 per TB for HDDs. Tape also consumes zero power when idle, unlike spinning disks. The IBM TS4500 tape library can hold over 40 PiB in a single rack. Major users include CERN, national archives, and film studios — Netflix stores its master copies on tape. Tape's main downside is sequential access: retrieving a specific file can take minutes versus milliseconds for disk.

CERN's Worldwide LHC Computing Grid stores approximately 300–400 PB (petabytes, decimal) of data across distributed sites, with the main Tier-0 facility at CERN holding about 100 PB on disk and 200 PB on tape. The LHC generates roughly 15 PB of data per year from collision events. Future upgrades (High-Luminosity LHC) are projected to increase this to 50–100 PB per year.

1 Gbps (gigabit) broadband delivers up to 125 MB/s, which is more than sufficient for most households. It supports dozens of simultaneous 4K streams, fast game downloads, and video conferencing with headroom to spare. The limiting factor is usually the Wi-Fi router (Wi-Fi 5 maxes out around 400–600 Mbps in practice) or the speed of the remote server you're downloading from.

10 Gbps networking is standard in data centers, server interconnects, and high-performance workstations doing large file transfers (video editing, database backups). It is increasingly available in prosumer home networking equipment. At 10 Gbps, a 1 TB file transfer takes about 13 minutes under ideal conditions.

One terabit equals 1,000 gigabits (SI). Terabit-per-second (Tbps) speeds are used in long-haul fiber optic cables and internet backbone infrastructure. A single transatlantic fiber cable typically carries hundreds of terabits per second across many multiplexed channels.

Wi-Fi 5 (802.11ac) delivers up to 3.5 Gbps theoretical, but typically 400–600 Mbps real-world on a single device. Wi-Fi 6 (802.11ax) reaches 9.6 Gbps theoretical and 600–900 Mbps practical per device, with better multi-device handling via OFDMA. Wi-Fi 6E extends the same technology into the uncongested 6 GHz band, improving real-world speeds to 1–2 Gbps. Wi-Fi 7 (802.11be) pushes the theoretical maximum to 46 Gbps using 320 MHz channels and 4096-QAM, with real-world single-device speeds expected around 2–5 Gbps — the first Wi-Fi standard to reliably exceed gigabit in practice.

Modern data centers handle enormous simultaneous traffic between thousands of servers — cloud computing, video streaming, and AI training all require massive internal bandwidth. 100 Gbps links between switches are now standard; 400 Gbps is increasingly deployed for spine connections. At these speeds, a single link can move 50 GB of data per second, keeping pace with NVMe storage arrays and GPU memory transfer rates.