Best Sandisk USB Flash Drives with USB-C in 2026: 11 Picks
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
Finding the best sandisk USB flash drives with USB-C requires checking the published specifications on each listing. We compared 11 models to help you choose based on actual data. The top pick is the SanDisk 32GB Ultra Dual Drive USB-C. It leads because it offers USB 3.1 support for efficient small file transfers. This guide helps you decide which drive fits your device connectivity and storage needs.
Quick picks
The best fit for you
- You need the most compact USB-C drive SanDisk 32GB Ultra Dual Drive USB-C It measures 0.37 inches in length, making it the smallest option listed.
- You require the fastest transfer speeds available SanDisk 256GB Ultra Dual Drive Go USB-C It supports USB 3.2 Gen 1 for quicker data movement between devices.
- You want the highest storage capacity SanDisk 1TB Extreme Fit USB-C Flash Drive It offers 1TB of space, which is the largest size on this list.
Our 11 picks
SanDisk 32GB Ultra Dual Drive USB-C
Best for: Small file transfers between Android and PC
- Connector Type
- USB-C (what this guide is about)
- Storage Capacity
- 32GB
- USB Version
- USB 3.1
- Read Speed
- Up to 150MB/s
- Features
- OTG Dual Drive
- Dimensions
- 0.37 × 1.5 × 0.79 inches
This SanDisk flash drive offers 32GB of storage with a retractable USB-C and USB-A design. It delivers read speeds up to 150MB/s via USB 3.1. The included Memory Zone app helps manage files on Android devices. It is a compact, portable option for users who need to transfer data between smartphones and computers. The small capacity makes it suitable for basic backups or specific file transfers.
Pros
- Retractable USB-C and USB-A connectors
- Read speeds up to 150MB/s
- Includes SanDisk Memory Zone app
- Compact and portable build
Cons
- Limited 32GB storage capacity
- Read speed lower than high-end models
- App required for Android management
Good fit if
- You need a dual-connector drive for Android and PC
- You have small files to transfer regularly
- You prefer a retractable design for protection
Skip if
- You require large storage for media files
- You need maximum transfer speeds for large datasets
- You want to manage files without installing an app
Verdict: SanDisk 32GB Ultra Dual Drive USB-C is a practical, compact solution for users who primarily transfer small files between Android devices and computers. Its dual connectors and app support make it convenient for everyday use, though the limited capacity and modest speed may not suit heavy data users.
SanDisk 32GB Dual Drive Go USB-C Flash Drive
Best for: basic mobile-to-computer transfers
- Connector Type
- USB-C (what this guide is about)
- Storage Capacity
- 32GB
- USB Version
- USB 3.1 Gen 1
- Read Speed
- 150MB/s
- Features
- OTG Dual Drive
- Dimensions
- 5.94 × 4.09 × 0.39 inches
View on Amazon: SanDisk 32GB Dual Drive Go USB-C Flash Drive
This 32GB flash drive features reversible USB-C and traditional USB-A connectors for easy use on phones and laptops. It offers USB 3.1 Gen 1 speeds with up to 150MB/s read performance. The compact black design fits in your pocket. It suits users who need a small, affordable drive for basic file transfers between compatible mobile devices and computers.
Pros
- Reversible USB-C and USB-A connectors
- Up to 150MB/s read speed
- USB 3.1 Gen 1 support
- Compact 32GB capacity
Cons
- Smaller 32GB storage capacity
- Lower read speed than premium models
- Requires SanDisk Memory Zone app for auto-backup
Good fit if
- You need a drive for USB-C phones
- You want a reversible connector
- You only need 32GB of space
Skip if
- You require high-speed data transfers
- You need more than 32GB
- You want faster read speeds
Verdict: SanDisk 32GB Ultra Dual Drive Go is a basic option for users who prioritize connector convenience over speed or capacity. It works well for small files on compatible devices.
SanDisk 128GB Ultra Dual Drive Go USB-C and USB-A
Best for: Users needing dual USB-C and USB-A connectivity
- Connector Type
- USB-C, USB-A (what this guide is about)
- Storage Capacity
- 128GB
- USB Version
- USB 3.1 Gen 1
- Read Speed
- Up to 400MB/s
- Compatible Device
- Mac, Tablets
- Features
- OTG Dual Drive
View on Amazon: SanDisk 128GB Ultra Dual Drive Go USB-C and USB-A
This 128GB flash drive features a reversible USB-C and traditional USB-A connector. It supports USB 3.1 Gen 1 for up to 400MB/s read speeds. The compact design measures 1.7 by 0.5 by 0.1 inches. You can use it to move content between USB-C phones and USB-A computers. It also supports automatic photo backups via the SanDisk Memory Zone app.
Pros
- Reversible USB-C and USB-A connectors
- Up to 400MB/s read speeds
- Compact 1.7-inch body
- Supports automatic photo backups with app
Cons
- Lower write speeds compared to higher-end models
- Requires SanDisk Memory Zone app for auto-backup
- Limited to USB 3.1 Gen 1 interface
Good fit if
- You need a drive for both USB-C phones and USB-A computers
- You want automatic photo backups on Android devices
- You prefer a reversible connector for easy plugging
Skip if
- You require write speeds faster than 150MB/s
- You need USB 3.2 or higher interface support
- You want a drive without an app requirement
Verdict: SanDisk 128GB Ultra Dual Drive Go is a versatile dual-connector drive for users who frequently switch between USB-C mobile devices and USB-A computers. It is ideal for those who value automatic photo backup features and reversible connectivity.
SanDisk 512GB Ultra Dual Drive Luxe USB-C/USB-A
Best for: high-capacity dual-connector storage
- Connector Type
- USB-C, USB-A (what this guide is about)
- Storage Capacity
- 512 GB
- Read Speed
- Up to 150MB/s
- Features
- OTG Dual Drive
- Dimensions
- 5.94 × 3.9 × 0.39 inches
- Weight
- 0.63 ounces
View on Amazon: SanDisk 512GB Ultra Dual Drive Luxe USB-C/USB-A
This all-metal flash drive features a reversible USB Type-C connector and a traditional USB Type-A plug. It offers 512 GB of storage and read speeds up to 150MB/s. You can use it to move content between USB Type-C devices and standard computers. The design allows you to free up space on smartphones by backing up photos automatically with the SanDisk Memory Zone app.
Pros
- 512 GB storage capacity
- Reversible USB Type-C and USB-A connectors
- All-metal build
- Up to 150MB/s read speeds
Cons
- Slower read speeds compared to Extreme PRO models
- Requires the SanDisk Memory Zone app for auto-backup
- Larger physical size than compact drives
Good fit if
- You need high capacity for large files
- You connect to both USB-C and USB-A ports
- You want a durable metal drive
Skip if
- You need transfer speeds over 400MB/s
- You prefer a compact, pocket-sized form factor
- You want built-in app-free backup
Verdict: SanDisk 512GB Ultra Dual Drive Luxe fits users who need ample space and dual compatibility. It is ideal for those who value metal durability and do not require extreme speed.
SanDisk 256GB Ultra Dual Drive Go USB-C
Best for: cross-device transfers with automatic backup
- Connector Type
- USB-C (what this guide is about)
- Storage Capacity
- 256GB
- USB Version
- USB 3.1 Gen 1
- Read Speed
- 150MB/s
- Features
- OTG Dual Drive
- Dimensions
- 6 × 4 × 0.05 inches
This 2-in-1 flash drive combines a USB Type-C connector with a traditional Type-A port for cross-device use. It offers 256GB of storage and read speeds up to 150MB/s via USB 3.1 Gen 1. The swivel design protects the connectors. It includes the SanDisk Memory Zone app for automatic photo backups on compatible devices.
Pros
- 256GB storage capacity
- Dual USB Type-C and Type-A connectors
- 150MB/s read speeds
- Swivel design protects ports
Cons
- 150MB/s read speed is slower than premium options
- Larger physical dimensions compared to compact drives
- Requires app for automatic backup features
Good fit if
- You need to transfer files between USB-C phones and standard computers
- You want automatic photo backup for your smartphone
- You require 256GB of portable storage
Skip if
- You need maximum transfer speeds for large files
- You prefer a compact drive without moving parts
- You do not want to use a companion app
Verdict: SanDisk Ultra Dual Drive Go 256GB USB-C is a practical solution for users bridging USB-C and USB-A devices. It suits those prioritizing ample storage and automatic backup features over raw speed.
SanDisk 64GB Ultra Slider USB-C
Best for: compact USB-C storage with retractable design
- Connector Type
- USB-C (what this guide is about)
- Storage Capacity
- 64GB
- USB Version
- USB 3.2 Gen 1
- Read Speed
- Up to 300MB/s
- Dimensions
- 6.3 × 4.33 × 0.79 inches
This SanDisk flash drive features a retractable USB Type-C connector, protecting the port from dust and wear. It offers 64GB of storage and read speeds up to 300MB/s via USB 3.2 Gen 1. The design includes a keyring hole for easy attachment to bags or keys. It is a compact, durable option for moving files between USB-C devices.
Pros
- Retractable USB Type-C connector protects against wear
- Read speeds up to 300MB/s
- USB 3.2 Gen 1 performance
- Keyring hole for portability
Cons
- Only 64GB capacity
- No included USB-A adapter
- Slower than Extreme PRO models
Good fit if
- You need a compact drive for USB-C phones or tablets
- You want a retractable connector to protect the port
- You carry your drive on a keyring
Skip if
- You require USB-A connectivity without an adapter
- You need more than 64GB of storage
- You need transfer speeds over 300MB/s
Verdict: SanDisk 64GB Ultra Slider USB-C is a solid choice for users who prioritize portability and connector protection. It fits buyers who frequently switch between USB-C devices and want a secure, keyring-friendly drive.
SanDisk 256GB Phone Drive USB-C and USB-A
Best for: Android users needing automatic backup and dual ports
- Connector Type
- USB-C, USB-A (what this guide is about)
- Storage Capacity
- 256 GB
- USB Version
- USB 3.2 Gen 1
- Read Speed
- Up to 100MB/s
- Compatible Device
- PC, Android, Tablets
- Weight
- 0.48 ounces
This SanDisk drive offers 256 GB of storage with USB-C and USB-A connectors. It supports USB 3.2 Gen 1 and provides read speeds up to 100MB/s. The included Memory Zone app enables automatic backups for Android devices. It also features RescuePRO Deluxe software for data recovery. This compact drive weighs 0.48 ounces and is designed for smartphones, tablets, and PCs.
Pros
- 256 GB storage capacity
- Dual USB-C and USB-A connectors
- Read speeds up to 100MB/s
- Automatic backup via Memory Zone app
- Includes RescuePRO Deluxe recovery software
Cons
- Read speed of 100MB/s is slower than other picks on this list
- Requires the Memory Zone app for automatic backup features
- Data recovery software requires registration and download
Good fit if
- You need to expand storage on an Android phone
- You want a drive with both USB-C and USB-A ports
- You value automatic photo and video backup
Skip if
- You need maximum transfer speeds for large files
- You primarily use a desktop PC without USB-C
- You prefer drives that do not require an app for basic use
Verdict: SanDisk 256GB Phone Drive USB-C is ideal for Android users who need convenient, app-assisted backups and dual-port connectivity. It is less suitable for users prioritizing high-speed data transfer.
SanDisk 512GB Extreme PRO Dual Drive
Best for: High-speed transfers between USB-C and USB-A devices
- Connector Type
- USB-C, USB-A (what this guide is about)
- Storage Capacity
- 512GB
- Read Speed
- Up to 1000MB/s
- Security Standard
- 128-bit AES
- Compatible Device
- PC, Mac, Tablets
- Features
- OTG Dual Drive
This dual-drive offers 512GB of storage with USB-C and USB-A connectors. It delivers up to 1,000MB/s read speeds and 900MB/s write speeds. The metal build adds durability for daily use. You get data encryption and a companion app for file management. It fits users who need fast transfers between modern and older devices.
Pros
- Up to 1,000MB/s read speed
- 900MB/s write speed
- USB-C and USB-A connectors
- Metal build for durability
- Data encryption included
Cons
- Higher capacity may be unnecessary for basic needs
- Requires the Memory Zone app for full features
- Larger than standard single-connector drives
Good fit if
- You need fast file transfers between USB-C and USB-A devices
- You store large creative projects or critical documents
- You prefer a durable metal build
Skip if
- You only need basic storage for small files
- You prefer a compact, single-connector design
- You do not want to use a companion app
Verdict: SanDisk 512GB Extreme PRO USB-C is the best choice for professionals who need maximum speed and dual connectivity. It suits those who value durability and security for large file transfers.
SanDisk 1TB Extreme Fit USB-C Flash Drive
Best for: High-capacity USB-C storage needs
- Connector Type
- USB-C (what this guide is about)
- Storage Capacity
- 1TB
- USB Version
- USB 3.2 Gen 1
- Read Speed
- Up to 400MB/s
- Dimensions
- 0.61 × 4 × 6 inches
This drive offers 1TB of storage in a USB-C form factor. It supports USB 3.2 Gen 1 with read speeds up to 400MB/s. The compact design fits snugly into USB Type-C computers and tablets. You can manage files using the SanDisk Memory Zone app for Windows or Mac. It is a practical option for users needing high capacity in a small package.
Pros
- 1TB storage capacity
- Read speeds up to 400MB/s
- USB 3.2 Gen 1 support
- Compatible with USB Type-C devices
Cons
- Write speeds are not specified in the data
- Physical dimensions of 4x6x0.61 inches are larger than typical thumb drives
- Requires a separate app for file management
Good fit if
- You need maximum storage in a USB-C drive
- You prioritize fast read speeds for large files
- You use Windows or Mac devices with USB-C ports
Skip if
- You require a compact thumb drive shape
- You need a drive for USB-A ports only
- You want a device with no software dependencies
Verdict: SanDisk 1TB Extreme Fit USB-C delivers high capacity and fast reads for USB-C users. It suits those who value storage space over a traditional thumb drive size.
SanDisk Ultra Dual Drive Go 128GB 2-Pack
Best for: Users needing two USB-C/USB-A drives
- Connector Type
- USB-C (what this guide is about)
- Storage Capacity
- 128GB
- Pack Quantity
- 2
- Features
- OTG Dual Drive
- Dimensions
- 10 × 2 × 0.1 inches
This SanDisk Ultra Dual Drive Go 2-Pack gives you two 128GB flash drives with reversible USB-C and USB-A connectors. You can move files between USB-C phones, tablets, and traditional computers. The drives support automatic photo backup via the SanDisk Memory Zone app. This set is ideal if you need extra storage for multiple devices or want a spare drive for daily use.
Pros
- Includes two 128GB drives in one pack
- Reversible USB-C and USB-A connectors
- Supports automatic photo backup with app
- Compact 2-inch width design
Cons
- Read speeds are not listed in the data
- Lacks the high performance of Extreme PRO models
Good fit if
- You need two drives for different devices
- You want to backup photos from a USB-C phone
- You use both USB-C and USB-A computers
Skip if
- You require the fastest possible transfer speeds
- You only need a single drive
- You need more than 128GB per drive
Verdict: SanDisk 128GB Dual Drive Go 2-Pack is a practical solution for users who need dual connectivity and extra capacity. It fits those who frequently switch between USB-C mobile devices and USB-A computers.
SanDisk 256GB USB-C Flash Drive
Best for: Everyday storage on USB-C devices
- Connector Type
- USB-C (what this guide is about)
- Storage Capacity
- 256GB
- USB Version
- USB-C
- Read Speed
- 250MB/s
- Compatible Device
- Laptop, Tablets
- Length
- 1.94 inches
This SanDisk drive offers 256GB of storage in a compact, reversible USB-C design. It delivers read speeds up to 250MB/s, making it suitable for transferring high-resolution photos and videos. The compact black build fits easily into pockets or bags. It is ideal for users with modern USB-C laptops or tablets who need reliable, thumb-sized storage without flipping connectors.
Pros
- 256GB capacity for large media libraries
- Reversible USB-C connector for easy insertion
- Read speeds up to 250MB/s
- Compatible with modern USB-C devices
Cons
- No included USB-A adapter for older ports
- Read speed slower than premium Extreme PRO models
- Only USB-C connector, lacks dual interface
Good fit if
- You need extra storage for a USB-C phone or tablet
- You want a reversible connector to avoid flipping
- You prioritize capacity over maximum transfer speeds
Skip if
- You require a USB-A connector for legacy computers
- You need write speeds exceeding 250MB/s
- You prefer a dual-drive with both USB-C and USB-A ports
Verdict: SanDisk 256GB USB-C Flash Drive provides ample space and a convenient reversible connector for everyday use. It suits users who value capacity and ease of use over professional-grade speed.
Specifications side by side
| Spec | SanDisk 32GB Ultra Dual Drive USB-C | SanDisk 32GB Dual Drive Go USB-C Flash Drive | SanDisk 128GB Ultra Dual Drive Go USB-C and USB-A | SanDisk 512GB Ultra Dual Drive Luxe USB-C/USB-A | SanDisk 256GB Ultra Dual Drive Go USB-C | SanDisk 64GB Ultra Slider USB-C | SanDisk 256GB Phone Drive USB-C and USB-A | SanDisk 512GB Extreme PRO Dual Drive | SanDisk 1TB Extreme Fit USB-C Flash Drive | SanDisk Ultra Dual Drive Go 128GB 2-Pack | SanDisk 256GB USB-C Flash Drive |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Storage Capacity | 32GB | 32GB | 128GB | 512 GB | 256GB | 64GB | 256 GB | 512GB | 1TB | 128GB | 256GB |
| USB Version | USB 3.1 | USB 3.1 Gen 1 | USB 3.1 Gen 1 | not specified | USB 3.1 Gen 1 | USB 3.2 Gen 1 | USB 3.2 Gen 1 | not specified | USB 3.2 Gen 1 | not specified | USB-C |
| Connector Type | USB-C, traditional USB | USB Type-C, USB Type-A | USB-C, USB-A | USB Type-C, Type-A | USB Type-C, Type-A | USB Type-C | USB Type-C, USB Type-A | USB-C, USB-A | USB Type-C | USB Type-C, Type-A | USB-C |
| Read Speed | Up to 150MB/s | 150MB/s | Up to 400MB/s | Up to 150MB/s | 150MB/s | Up to 300MB/s | Up to 100MB/s | Up to 1000MB/s | Up to 400MB/s | not specified | 250MB/s |
| Security Standard | not specified | not specified | not specified | not specified | not specified | not specified | not specified | 128-bit AES | not specified | not specified | not specified |
| Pack Quantity | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | 2 | not specified |
| Compatible Device | not specified | not specified | Mac, Tablets | not specified | not specified | not specified | PC, Android, Tablets | PC, Mac, Tablets | not specified | not specified | Laptop, Tablets |
| Size | 32GB | 32GB | 128 GB | 512 GB | not specified | 64GB | 256 GB | 512GB | 1TB | not specified | 256GB |
| Features | OTG Dual Drive | OTG Dual Drive | OTG Dual Drive | OTG Dual Drive | OTG Dual Drive | not specified | not specified | OTG Dual Drive | not specified | OTG Dual Drive | not specified |
| Dimensions | 0.37 × 1.5 × 0.79 inches | 5.94 × 4.09 × 0.39 inches | 1.7 × 0.5 × 0.1 inches | 5.94 × 3.9 × 0.39 inches | 6 × 4 × 0.05 inches | 6.3 × 4.33 × 0.79 inches | not specified | 3.2 × 0.7 × 0.1 inches | 0.61 × 4 × 6 inches | 10 × 2 × 0.1 inches | not specified |
| Weight | 0.32 ounces | not specified | not specified | 0.63 ounces | not specified | not specified | 0.48 ounces | 0.8 ounces | not specified | not specified | not specified |
| Length | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | 1.94 inches |
| Width | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | 0.81 inches |
| Color | Black, Silver | Black | Black | Silver | Multicolor | Black | Black | Multicolor | Black | Black | Black |
| Model | SDDDC2-032G-G46 | SDDDC3-032G-G46 | SDDDC3-0128G-G46 | SDDDC4-512G-G46 | SDDDC3-256G-A46 | SDCZ480-064G-G46 | SDDDC6-256G-G46 | SDDDE1-512G-G46 | SDCZ530-1T00-G46 | 990403696 | SDCZB-256G-G46 |
How to choose the right USB-C drive
-
Check dual connector needs
You must decide if you need one or two connectors. The SanDisk 32GB Ultra Dual Drive Go USB-C and USB-A has both ports. This helps you switch between mobile devices and older computers without adapters. If you only use modern USB-C devices, a single-connector model like the SanDisk 64GB Ultra Slider USB-C is sufficient. Single connectors are often smaller and lighter. Dual connectors add bulk but offer flexibility. Choose based on the devices you use daily.
-
Match storage capacity
Storage size determines how many files you can keep. The SanDisk 32GB Ultra Dual Drive USB-C holds small files well. It is not suitable for large media libraries. If you need more space, the SanDisk 1TB Extreme Fit USB-C offers maximum capacity. It stores thousands of photos or videos. Mid-range options like the SanDisk 128GB Ultra Dual Drive Go balance size and cost. Choose the smallest capacity that fits your typical workflow to save money and reduce weight.
-
Verify USB version
USB version affects transfer speed. The SanDisk 64GB Ultra Slider USB-C supports USB 3.2. This is newer than the USB 3.1 in the top pick. Newer versions generally move data faster. However, speed also depends on the drive controller. The SanDisk 1TB Extreme Fit lists a 400MB/s read speed. This is significantly faster than the 150MB/s read speed of the SanDisk 512GB Ultra Dual Drive Luxe. Check the listed read speed for performance comparisons.
-
Consider physical dimensions
Size impacts portability. The SanDisk 32GB Ultra Dual Drive USB-C is very compact. It measures 0.37 inches in length. This makes it easy to attach to a keyring. Larger drives like the SanDisk 256GB Ultra Dual Drive Go USB-C measure 6 inches long. These are harder to carry. If you travel frequently, choose a compact model. If the drive stays in your desk, size matters less. Measure the available space on your device port before buying.
-
Assess build durability
Material choice affects longevity. The SanDisk 512GB Ultra Dual Drive Luxe features a metal body. This offers better durability against drops and wear. Plastic models like the SanDisk 32GB Dual Drive Go are lighter but more fragile. Metal drives also dissipate heat better during large transfers. If you work in rough environments, prioritize metal construction. For casual use, plastic is acceptable. Check the product description for material details to ensure the drive matches your usage conditions.
Frequently asked questions
Which SanDisk USB-C drive is best for Android backups?
The SanDisk 256GB Phone Drive is designed for this task. It includes an app for automatic photo backups on Android devices. It features both USB-C and USB-A connectors, allowing you to use it with phones and computers. This model prioritizes convenience and storage over raw transfer speeds.
What is the fastest SanDisk USB-C drive listed?
The SanDisk 1TB Extreme Fit USB-C offers the highest read speed at 400MB/s. The 128GB Ultra Dual Drive Go also lists this speed. These drives suit users moving large files quickly. Most other models in this list have lower speed ratings, focusing more on portability or capacity.
Do all these drives have two connectors?
No, not all models include dual ports. The SanDisk 32GB Ultra Dual Drive USB-C and the 64GB Ultra Slider have only a USB-C connector. Several others, like the 128GB Ultra Dual Drive Go, include both USB-C and USB-A ports for broader compatibility with older computers.
Which drive has the largest storage capacity?
The SanDisk 1TB Extreme Fit USB-C provides the maximum storage at 1TB. It is ideal for users needing extensive space for media files. Other high-capacity options include the 512GB Extreme PRO Dual Drive and the 512GB Ultra Dual Drive Luxe, which offer substantial room for data.
Is there a SanDisk drive with a retractable design?
Yes, the SanDisk 64GB Ultra Slider USB-C features a retractable design. This mechanism protects the connector when not in use. It is compact and fits well on a keyring. This model uses USB 3.2 technology, offering slightly faster performance than older USB 3.1 drives in the list.
Which drive is best for users who need metal durability?
The SanDisk 512GB Ultra Dual Drive Luxe is noted for its metal construction. This design provides durability for users who need a robust drive. It offers dual connectivity with USB-C and USB-A ports. While it has a modest read speed of 150MB/s, the build quality is a key feature.
Can I use these drives with both phones and computers?
Yes, most models support OTG (On-The-Go) functionality. The SanDisk 32GB Ultra Dual Drive Go and the 256GB Ultra Dual Drive Go are explicitly labeled as OTG dual drives. This allows you to transfer files between USB-C mobile devices and computers without needing extra adapters.