Minnislykillinn er neðst í töskunni.

Minnislykillinn means the USB stick, the flash drive, or literally the memory key.

It breaks down like this:

• minni = memory
• lykill = key
• minnislykill = memory key / USB stick
• minnislykillinn = the USB stick

So the -inn at the end is the definite article, attached to the noun.

In Icelandic, the definite article is usually added to the end of the noun instead of being a separate word like English the.

So:

• minnislykill = a USB stick / USB stick
• minnislykillinn = the USB stick

This is very common in Icelandic. You will see the same thing in:

• taska = bag
• taskan = the bag

In this sentence, though, you get töskunni, not taskan, because the case is different.

Because the preposition í can take different cases, and here it takes the dative.

The basic noun is:

• taska = bag

But after í when it means in in the sense of location, Icelandic uses the dative:

• í tösku = in a bag
• í töskunni = in the bag

So töskunni is the dative singular definite form of taska.

You may also notice the vowel change:

• taska
• tösku
• töskunni

That kind of vowel change is normal in Icelandic inflection.

Because this sentence describes location, not movement.

A very important Icelandic pattern is:

• í + accusative = movement into
• í + dative = location in

So compare:

• Minnislykillinn er í töskunni. = The USB stick is in the bag.
  
  • location, so dative
• Ég set minnislykilinn í töskuna. = I put the USB stick into the bag.
  
  • movement into it, so accusative

This is one of the most important preposition patterns to learn.

Neðst means lowest, at the bottom, or down at the bottom.

It comes from the adjective/adverb family built around neðar / neðri / neðstur ideas of lower and lowest.

In this sentence, neðst works adverbially and means something like:

• at the bottom
• lowest down

So:

• Minnislykillinn er neðst í töskunni.
  = The USB stick is at the bottom of the bag.

It is not simply the same as niður, which usually means down as direction or movement.

Very roughly:

• niður = down/downward
• neðst = at the bottom / lowest

Both can express a similar idea, but they are not exactly the same in style.

• neðst í töskunni = at the bottom of the bag / lowest down in the bag
• á botninum í töskunni or á botni töskunnar = on the bottom of the bag

Neðst is a very natural way to describe something being located low down within something. It focuses on position within the bag rather than literally touching the bottom surface.

So neðst í töskunni is idiomatic and very common.

Yes, er is completely normal here.

Icelandic often uses vera (to be) in location sentences, just as English does:

• Bókin er á borðinu. = The book is on the table.
• Minnislykillinn er neðst í töskunni. = The USB stick is at the bottom of the bag.

A more specific location verb can sometimes be used, but er is the default and most natural choice in many contexts.

Yes, Icelandic word order is somewhat flexible, although the basic version here is very natural:

• Minnislykillinn er neðst í töskunni.

You could also get variations for emphasis, such as:

• Neðst í töskunni er minnislykillinn.

That might sound more like:

• At the bottom of the bag is the USB stick.

So the original sentence is the most neutral everyday order, but other orders are possible if you want to emphasize location.

A rough English-friendly guide would be something like:

• MINN-is-lik-ill-inn

A few notes:

• nn is pronounced as a long/doubled consonant
• y in Icelandic is pronounced like i, so lykill sounds closer to likill than to English ly
• ll in Icelandic often has a special pronunciation, not exactly like English ll
• the stress is usually on the first syllable: MINN-

If you want to be more accurate, it is better to listen to native audio, because Icelandic consonants and doubled sounds can be tricky.

Yes. Minnislykill is a normal Icelandic word for a USB stick or flash drive.

It is a good example of how Icelandic often forms native-looking compound words instead of borrowing the exact English term.

Literally:

• minni = memory
• lykill = key

So to an English speaker it may feel a bit unusual at first, but it is perfectly standard Icelandic.

Here it is in the nominative singular definite.

That is because it is the subject of the sentence:

• Minnislykillinn = the USB stick
• er = is
• neðst í töskunni = at the bottom of the bag

So the structure is:

• subject: Minnislykillinn
• verb: er
• location phrase: neðst í töskunni

If you changed the sentence so that the USB stick became an object, its form would change accordingly.