Comment tester la capacité réelle d'une clé USB à l'aide d'un logiciel gratuit ?

So why do some 64GB USB Flash Drives cost 25 yuan while others are only 15? Beware – you could well be buying a ‘capacity expanded drive’. I’m Mona, from Shenzhen YOUSAN USB flash drive Factory and I’m going to burn my bridges and expose the biggest dark secret in the industry. Let’s use the free, and pretty neat software ‘H2testw’ to find out.

1. Qu'est-ce qu'un "disque d'expansion" ?

What you thought was “fake goods”: Rough casing, no response when you plug it in. No, today’s “capacity-expanded drives” are smarter than that. They are smarter than you think. When you hook a USB drive sold as 64GB into your computer Windows will report: “Available space: 62.5GB”. You can even drop files onto it and the progress bar looks normal! Everything looks perfect. The black tech behind it: Small workshops or rogue manufacturers recycle found 4GB chips. They adjust some controller parameters using mass-production machinery, fooling the whole computer system into displaying as a 64GB device. It’s like a bucket that only holds 4 litres of water getting a sticker slapped on it saying “64 litres” and selling it to you at 64 litres price.

2. Que se passe-t-il lors de l'utilisation de lecteurs d'extension ?

De nombreux acheteurs optent pour ces disques pour économiser de l'argent, mais se font ensuite sévèrement réprimander par leur patron. Les disques d'extension présentent un défaut critique : l'écriture en boucle.

1. 1st 4Gb : normal writes, files open.
2. 4Gb or more : “Write successful” is displayed and the datd is written to disk – but since no physical space is left, the new data overwrites the old, or just disappears.
3. Your customer gets the USB stick, copies all their photos and contracts, and opens it up when they get home. And the filenames are all there, but the contents of the files is gibberish or fails to open, all the data is completely out of action.

3. Comment tester la capacité réelle à l'aide de H2testw ?

When faced with this situation, don’t take the vendor’s word for it, and don’t trust what your computer tells you about its properties. The truth will become apparent with just one free piece of software: H2testw. It’s the world standard for determining true capacity in the industry.

Step-By-Step process (Mona’s Step-By-Step Walkthrough):

4. YOUSAN Professional USB Drive Manufacturer’s Commitment:We Sell Reputation, Not Trash!

In Shenzhen’s electronics wholesale markets, overcapacity drives can double profits, but YOUSAN usb flash drive steadfastly refuses to manufacture them.
Every chip we use is Grade A genuine full-capacity, such as from Samsung/SK Hynix/Micron, etc. Before shipment, 100% of our QC assembly line conducts H2testw verification. We do not have to “steal capacity” in order to make money, which means we want to see your repeat orders next year!

Mona’s Advice:
Quel que soit le fournisseur auprès duquel vous achetez des clés USB, envoyez-lui ce message avant de passer commande :
"Acceptation sur la base des résultats du test H2. En cas d'échec (barre rouge), je renverrai toutes les unités et refuserai le paiement."
If they respond evasively, it shows they have something to hide and won’t dare take your order. If they’re an honest factory like YOUSAN, they’ll applaud you.