---
license:
- other
license_details: 'https://www.backblaze.com/cloud-storage/resources/hard-drive-test-data#howYouCanUseTheData'
annotations_creators:
- 'machine-generated'
pretty_name: 'Drive Stats'
size_categories:
- '100M<n<1B'
---

# Drive Stats

[**Drive Stats**](https://www.backblaze.com/cloud-storage/resources/hard-drive-test-data) is a public data set of daily metrics on the hard drives in Backblaze’s [cloud storage infrastructure](https://www.backblaze.com/cloud-storage) that Backblaze has open-sourced since April 2013. Currently, Drive Stats comprises over 388 million records, rising by over 240,000 records per day. Drive Stats is an append-only dataset effectively logging daily statistics that once written are never updated or deleted.

This is our first Hugging Face dataset; feel free to suggest improvements by creating a new discussion on the [Community](https://huggingface.co/datasets/backblaze/Drive_Stats/discussions)!

## Drive Stats Q2 2023 Snapshot

* Drive Count: 240,940
* Drive Failures: 1,339
* Drive Days: 21.1M
* Annualized Failure Rate: 2.28%

## Overview of the Hard Drive Data

Each day in the Backblaze data center, we take a snapshot of each operational hard drive. This snapshot includes basic drive information along with the S.M.A.R.T. statistics reported by that drive. The daily snapshot of one drive is one record or row of data. All of the drive snapshots for a given day are collected into a file consisting of a row for each active hard drive. The format of this file is a "csv" (Comma Separated Values) file. Each day this file is named in the format YYYY-MM-DD.csv, for example, 2013-04-10.csv.

The first row of the each file contains the column names, the remaining rows are the actual data. The columns are as follows:

* Date – The date of the snapshot in yyyy-mm-dd format.
* Serial Number – The manufacturer-assigned serial number of the drive.
* Model – The manufacturer-assigned model number of the drive.
* Capacity – The drive capacity in bytes.
* Failure – Contains a “0” if the drive is OK. Contains a “1” if this is the last day the drive was operational before failing.
* SMART Stats:
    * 2013-2014: 80 columns of data, that are the Raw and Normalized values for 40 different SMART stats as reported by the given drive. Each value is the number reported by the drive.
    * 2015-2017: 90 columns of data, that are the Raw and Normalized values for 45 different SMART stats as reported by the given drive. Each value is the number reported by the drive.
    * 2018 (Q1): 100 columns of data, that are the Raw and Normalized values for 50 different SMART stats as reported by the given drive. Each value is the number reported by the drive.
    * 2018 (Q2): 104 columns of data, that are the Raw and Normalized values for 52 different SMART stats as reported by the given drive. Each value is the number reported by the drive.
    * 2018 (Q4): 124 columns of data, that are the Raw and Normalized values for 62 different SMART stats as reported by the given drive. Each value is the number reported by the drive.

## Helpful Hints and Caveats

### Schema Changes

The schema may change from quarter to quarter. The basic information: date, serial_number, model, capacity_bytes, and failure will not change. All of the changes will be in the number of SMART attributes reported for all of the drives in a given quarter. There will never be more than 255 pair of SMART attributes reported. When you load the CSV files for each quarter you will need to account for the potential of a different number of SMART attributes from the previous quarter.

## How You Can Use the Data

You can download and use this data for free for your own purpose, all we ask is three things:

* you cite Backblaze as the source if you use the data,
* you accept that you are solely responsible for how you use the data, and
* you do not sell this data to anyone, it is free.