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Lenovo M630e Desktop with Windows 10 and Office 365

Hi,M630e Desktop.jpg
 
This is in Windows 10 and Office 365 environment.
I have a Lenovo M630e Desktop (ThinkCentre -Type 10 YM).
I want to replace the Hard disk of this Desktop.
When I open this desktop, I did not see any Hard disk? (Please see the attachment).
Would somebody show me where is the hard disk? What kind of hard disk is it?.
 
Thanks,
tjie
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Dr. Klahn

The Lenovo M630e does not use a traditional hard drive.  It incorporates an M.2 solid-state disk.  The from-the-factory size of the SSD is 256 GB and the interface is PCIe.

So you'll need to look for an M.2 SSD with (at least) PCIe interface and in the same physical size as the original SSD ... unless Lenovo left enough space to use a longer SSD.
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@Questions:

1) It seems the hard disk is M2 SSD (Is it the right name?).
2)  Does this  M2 SSD also function as wireless card?

Thanks,
Tjie
No.  You would not want both network and disk drive to be on the same card, in any case.  Change one, lose 'em both.  WiFi standards change every few years and it would be unproductive to throw away a perfectly usable disk drive simply because WiFi changed.

Typically a WiFi interface is either built-in (which gives it a limited lifetime when WiFi standards change every few years) or is an add-in mini-PCIe card.
it is an M.2   ssd  - note the point between 2 letters :  What Is an M.2 SSD? A Basic Definition | Tom's Hardware 
in most cases, you can replace it by removing 1 screw that holds it
here the manual :  M630e Hardware Maintenance Manual (lenovo.com) 
find the HDD in attachedUser generated image
Doesn't look like the SSD since it is connected to an antenna.

The M.2 slots are on the other side of the motherboard (under the opposite cover) for the M720q tiny so probably the same for the M630e.

EDIT: Indeed they are, https://www.youtube.com/watch?v=-SC6_v8Mw-I
(anyone know what the intro music is?)

You can just see one of the chips on it through a hole in your photo...User generated image
you have to remove the shield first to expose the m.2 drive  
see page 81 of the manual https://download.lenovo.com/pccbbs/thinkcentre_pdf/m630e_hmm_en.pdf
Only references to a shield in that manual are the dust shield and the wi-fi shield. M'2 drive is on the other side of the board. M630e seems to be the same planar as M70q but stripped down to reduce cost, e.g. no 2nd M.2 socket fitted.
Oh well downgrade it if you want by replacing NVMe with SATA
why not install a bigger M.2 drive?