当今使用的存储卡种类繁多，令人困惑。有 SD 卡，有 microSD 卡，有 miniSD 卡，还有SDHC卡。
在整个 SD 卡变体系列中，有一个奇怪的异常值——TF 卡。使用与大多数存储卡完全不同的命名方案，它引出了一个明显的问题：
什么是 TF 卡，它与标准 SD 卡有何不同？
为什么SD 卡有这么(SD Cards Have So)多名字？
让我们首先解决为什么有这么多类型的存储卡的问题。
您可能知道，SD 卡（或Secure Digital Cards ）是由(Secure Digital Cards)Secure Digital Association开发的存储设备（通常缩写为 SD 协会或简称为SDA）。作为闪迪(SanDisk)、松下(Panasonic)和东芝(Toshiba)的合资企业，SDA的任务是开发半导体闪存（如 SSD 硬盘(like SSD hard drives)）。
但随着技术多年来的发展，这些闪存卡开始用于各种设备，从MP3播放器到 iPhone。因此，较新版本的 SD 卡获得了更大的容量。这些容量由 HC（高容量(High Capacity)）、XC（扩展容量(Capacity)）和 UC（超容量(Ultra Capacity)）等后缀表示。
由于这包括存储空间超过 2 GB 的所有卡，因此您今天看到的大多数 SD 卡的名称都会附加这些后缀之一。MicroSDHC卡是最流行的，最高容量的版本是SDXC卡。
TF卡：手机用SD卡
随着移动设备越来越流行，很明显，计算的未来必须针对该细分市场。但是 SD 存储卡，甚至是 miniSD 卡，对于迅速缩小的手机来说都太大了。所以必须制定一个新的标准。
SanDisk和摩托罗拉(Motorola)合作开发了T-Flash卡，其容量高达 512 MB，尺寸比指甲还小。与T-mobile(T-mobile)的商标纠纷导致名称成为TransFlash卡，通常简称为 TF 卡。
随着第一款配备全新 TF 卡的摩托罗拉手机推出，人们对该技术的兴趣也随之增加。(Motorola)SD 协会(SD Association)最终获得了该标准，将其重新命名为MicroSD卡。
这导致了世界上最小的存储卡的发布，适用于各种小工具。除了Android和 iOS 智能手机之外，视频游戏机和行车记录仪等设备也采用了 microSD 卡。
那么 MicroSD 卡有什么不同吗？
MicroSD卡和 TF 卡具有相同的功能。由于智能手机和数码相机的普及，如今使用的大多数 SD 卡实际上都是 microSD 卡。
TF 存储卡只是 microSD 的旧版本，容量通常较低。它们使用相同的 SD 卡插槽 - 任何接受 microSD 卡的读卡器（包括笔记本电脑的内部读卡器）也可以接受 TF 卡，没有任何问题(will accept a TF card as well without any issues)。
MicroSD卡通常会表现出比 TF 卡更好的性能，只是因为(MicroSD)SDA仍在不断开发它们。无论是存储容量还是读写速度，microSD 卡都取得了长足的进步，让旧的 TF 卡尘埃落定。
你还能买TF卡吗？
今天很难找到没有官方 microSD 品牌的 SD 卡。HC 和 XC 存储卡的推出彻底改变了市场，现在您可以买到的大多数存储卡的存储容量都超过了 8 GB。
因此，任何制造商都没有理由继续销售过时的 TF 卡，这些卡是在大容量存储卡出现之前发布的。今天获得一张 TF 卡的唯一方法是，如果您在首次发布时就已经拥有一张 TF 卡。
TF 卡(Do TF Cards Differ)与SD 卡(SD Card)有何
不同？
TF 卡只是 microSD 卡早期迭代的名称。它使用相同的插槽，以相同的方式工作，甚至具有相似的外形尺寸。
唯一的区别在于技术规格。这是因为 microSD 卡不断得到 SD 协会的更新，而唯一流通的 TF 卡是早期销售的。
如果您仍然拥有 TF 卡，您可以继续在任何智能手机或读卡器上使用它，没有任何麻烦。请记住，尽管它们的性能无法与任何现代 microSD 卡相提并论，但升级(a good idea to upgrade).
What Are TF Cards (And How They Differ From SD Cards)?
There is a confusing variety of memorу cards in use todаy. There are SD cardѕ, there are microSD cards, there are miniSD cards, and there are SDHC cards.
In this whole lineup of SD card variants lies a curious outlier – the TF card. With a completely different naming scheme than used by most memory cards, it begs the obvious question:
What is a TF card and how is it different from a standard SD card?
Why Do SD Cards Have So Many Names?
Let us first tackle the question of why there are so many types of memory cards in the first place.
As you might know, SD cards (or Secure Digital Cards) are storage devices developed by Secure Digital Association (usually shortened to SD association or just SDA). Formed as a joint venture between SanDisk, Panasonic, and Toshiba, SDA is tasked with developing semiconductor flash memories (like SSD hard drives).
But as the technology evolved over the years, these flash memory cards started being used with all sorts of devices, from MP3 players to iPhones. As a result, newer versions of the SD card got larger capacities. These capacities were denoted by suffixes like HC (High Capacity), XC (eXtended Capacity), and UC (Ultra Capacity).
As this includes all cards with storage space in excess of 2 GB, most SD cards you see in use today will have one of these suffixes attached to their names. MicroSDHC cards are the most prevalent, with the top-capacity versions being SDXC cards.
TF Card: SD Card for Mobile Phones
As mobile devices grew more and more popular, it became clear that the future of computing had to target that segment. But SD memory cards, even miniSD cards, were too large for the rapidly shrinking cell phone. So a new standard had to be developed.
SanDisk and Motorola worked together to create T-Flash cards, boasting capacities up to 512 MB in a size smaller than a fingernail. A trademark dispute with T-mobile led to the name becoming TransFlash card, which was often shortened to just TF card.
As the first Motorola phone rolled out with the brand new TF card, interest rose in the technology. The SD Association ultimately acquired the standard, rechristening it to the MicroSD card.
This resulted in the release of the world’s smallest memory cards, suitable for use with gadgets of all kinds. Apart from Android and iOS smartphones, microSD cards were adopted by things like video game consoles and dashcams.
So Are MicroSD Cards Different?
MicroSD cards and TF cards have the same functionality. Most of the SD cards in use today are actually microSD cards, thanks to the popularity of smartphones and digital cameras.
A TF memory card is simply an older version of the microSD, with generally lower capacity. They use the same SD card slot – any card reader (including internal card readers in laptops) that accepts a microSD card will accept a TF card as well without any issues.
MicroSD cards will usually demonstrate better performance than TF cards, just because they are still being continuously developed by SDA. Be it storage capacity or read-write speeds, microSD cards have come a long way, leaving the older TF cards in the dust.
Can You Still Buy TF Cards?
It is very difficult to find an SD card without the official microSD branding today. The introduction of HC and XC memory cards completely transformed the market, and most memory cards you can buy today have storage capacities in excess of 8 GB.
As such, there’s no reason for any manufacturer to continue selling outdated TF cards, which were released before high-capacity memory cards were a thing. The only way to get a TF card today is if you already own one from its initial launch.
How Do TF Cards Differ From an SD Card?
TF cards are just the name of an early iteration of the microSD card. It uses the same slot, works the same way, and even has a similar form factor.
The only difference lies in technical specifications. This is because microSD cards have continued to get updates by the SD association, while the only TF cards in circulation are the ones sold in the early days.
If you still possess a TF card, you can continue using it with any smartphone or card reader without any hassle. Keep in mind though that their performance is not going to be on par with any modern microSD card, and it would be a good idea to upgrade.
